Annual average daily traffic ( AADT ) is a measure used primarily in transportation planning , transportation engineering and retail location selection . Traditionally, it is the total volume of vehicle traffic of a highway or road for a year divided by 365 days. AADT is a simple, but useful, measurement of how busy the road is.
134-951: Interstate 90 ( I-90 ) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at 3,021 miles (4,862 km). It begins in Seattle, Washington , and travels through the Pacific Northwest , Mountain West , Great Plains , Midwest , and the Northeast , ending in Boston , Massachusetts. The highway serves 13 states and has 15 auxiliary routes , primarily in major cities such as Chicago , Cleveland , Buffalo , and Rochester . I-90 begins at Washington State Route 519 in Seattle and crosses
268-507: A Highway Performance Monitoring System (HPMS) report. The HPMS report contains various information regarding the road segments in the state based on a sample (not all of the road segments) of the road segments. In the report, the AADT is converted to vehicle miles traveled (VMT). VMT is the AADT multiplied by the length of the road segment. To determine the amount of traffic a state has, the AADT cannot be summed for all road segments since an AADT
402-576: A ceiling panel collapse that killed one person. It reopened in January 2007 after repairs and retrofit work. Freeway A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway , motorway , and expressway . Other similar terms include throughway or thruway and parkway . Some of these may be limited-access highways , although this term can also refer to
536-663: A dual highway ) in 1932 between Cologne and Bonn . It then rapidly constructed the first nationwide system of such roads. The first North American freeways (known as parkways) opened in the New York City area in the 1920s. Britain, heavily influenced by the railways, did not build its first motorway , the Preston By-pass ( M6 ), until 1958. Most technologically advanced nations feature an extensive network of freeways or motorways to provide high-capacity urban travel, or high-speed rural travel, or both. Many have
670-466: A median separates the opposite directions of traffic. This strip may be as simple as a grassy area, or may include a crash barrier such as a " Jersey barrier " or an "Ontario Tall Wall" to prevent head-on collisions . On some freeways, the two carriageways are built on different alignments; this may be done to make use of available corridors in a mountainous area or to provide narrower corridors through dense urban areas . Control of access relates to
804-562: A brief concurrency with US 218 . From Austin, the freeway turns northeast to head towards Rochester , which it bypasses to the south and intersects US 63 and US 52 . I-90 continues east into the hilly Driftless Area and descends from the bluffs that overlook Lake Onalaska on the Mississippi River . It turns southeast at Dakota and is joined by US 14 until the highways split near La Crescent . I-90 turns east before it reaches La Crescent, where it crosses
938-561: A class of highways with somewhat less isolation from other traffic. In countries following the Vienna convention , the motorway qualification implies that walking and parking are forbidden. A fully controlled-access highway provides an unhindered flow of traffic, with no traffic signals , intersections or property access . They are free of any at-grade crossings with other roads, railways, or pedestrian paths, which are instead carried by overpasses and underpasses . Entrances and exits to
1072-707: A cloverleaf and trumpet interchange when it opened in 1937, and until the Second World War , boasted the longest illuminated stretch of roadway built. A decade later, the first section of Highway 401 was opened, based on earlier designs. It has since gone on to become the busiest highway in the world. The word freeway was first used in February 1930 by Edward M. Bassett . Bassett argued that roads should be classified into three basic types: highways, parkways , and freeways. In Bassett's zoning and property law -based system, abutting property owners have
1206-703: A concurrency with I-80. I-94 travels northeast near the Lake Michigan shoreline from Lake Station to Michigan City , while the Indiana Toll Road (I-80/I-90) follows it to the south. The tollway then moves closer to the Michigan –Indiana state line and turns east, passing through the northern outskirts of South Bend and Elkhart . In South Bend, it intersects US 31 and passes near the University of Notre Dame . I-80/I-90 travels parallel to
1340-582: A designated National Heritage Area and National Scenic Byway . The freeway crosses Snoqualmie Pass , elevation 3,022 feet (921 m), at the crest of the mountain range near a ski resort . From Snoqualmie Pass, I-90 follows the Yakima River into the Kittitas Valley and intersects I-82 in Ellensburg after a brief concurrency with U.S. Route 97 (US 97). The highway crosses
1474-620: A freeway, specialized pedestrian footbridges or tunnels may also be provided. These structures enable pedestrians and cyclists to cross the freeway at that point without a detour to the nearest road crossing. Access to freeways is typically provided only at grade-separated interchanges , though lower-standard right-in/right-out (left-in/left-out in countries that drive on the left) access can be used for direct connections to side roads. In many cases, sophisticated interchanges allow for smooth, uninterrupted transitions between intersecting freeways and busy arterial roads . However, sometimes it
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#17327724347951608-775: A junction with I-25 , which overlaps with US 87 to Casper . From Buffalo, the highway turns east to cross the Powder River Basin , a region with several large coal mines. I-90 then reaches Gillette , where it begins a concurrency with US 14 and US 16 to a three-way split in Moorcroft . The freeway continues into the Bear Lodge Mountains (part of the Black Hills ) and is rejoined in Sundance by US 14, which looped north to serve
1742-434: A larger number of guide signs than other roads, and the signs themselves are physically larger. Guide signs are often mounted on overpasses or overhead gantries so that drivers can see where each lane goes. Exit numbers are commonly derived from the exit's distance in miles or kilometers from the start of the freeway. In some areas, there are public rest areas or service areas on freeways, as well as emergency phones on
1876-499: A legal status which limits the types of vehicles that can use a highway, as well as a road design that limits the points at which they can access it. Major arterial roads will often have partial access control , meaning that side roads will intersect the main road at grade, instead of using interchanges, but driveways may not connect directly to the main road, and drivers must use intersecting roads to access adjacent land. At arterial junctions with relatively quiet side roads, traffic
2010-690: A loop on I-490 and the direct north–south spur I-390 . I-90 travels through the Finger Lakes region and moves closer to the Erie Canal as it approaches the Syracuse area. It travels through the city's northern outskirts, where it intersects I-690 , I-81 , and I-481 from west to east. It then continues to Utica , where the Thruway runs along the north side of the Mohawk River (part of
2144-527: A milepost system but does not use milepost markers. In Europe and some other countries, motorways typically have similar characteristics such as: Two-lane freeways , often undivided, are sometimes built when traffic volumes are low or right-of-way is limited; they may be designed for easy conversion to one side of a four-lane freeway. (For example, most of the Bert T. Combs Mountain Parkway in eastern Kentucky
2278-447: A motorway is understood as a public road with dual carriageways and at least two lanes each way. All entrances and exits are signposted and all interchanges are grade separated. Central barrier or median present throughout the road. No crossing is permitted, while stopping is permitted only in an emergency. Restricted access to motor vehicles, prohibited to pedestrians, animals, pedal cycles, mopeds, agricultural vehicles. The minimum speed
2412-777: A national-level or even international-level (e.g. European E route ) system of route numbering . There are several international standards that give some definitions of words such as motorways, but there is no formal definition of the English language words such as freeway , motorway , and expressway , or of the equivalent words in other languages such as autoroute , Autobahn , autostrada , autocesta, autoput , that are accepted worldwide—in most cases these words are defined by local statute or design standards or regional international treaties. Descriptions that are widely used include: One green or blue symbol (like [REDACTED] ) appears at motorway entry in countries that follow
2546-600: A number of patterns. The actual pattern is determined by a number of factors including local topology, traffic density, land cost, building costs, type of road, etc. In some jurisdictions feeder/distributor lanes are common, especially for cloverleaf interchanges ; in others, such as the United Kingdom, where the roundabout interchange is common, feeder/distributor lanes are seldom seen. Motorways in Europe typically differ between exits and junctions. An exit leads out of
2680-624: A park and where intersecting streets crossed over bridges. The Southern State Parkway opened in 1927, while the Long Island Motor Parkway was closed in 1937 and replaced by the Northern State Parkway (opened 1931) and the contiguous Grand Central Parkway (opened 1936). In Germany, construction of the Bonn-Cologne Autobahn began in 1929 and was opened in 1932 by Konrad Adenauer , then
2814-457: A private venture, was the world's first limited-access roadway. It included many modern features, including banked turns , guard rails and reinforced concrete tarmac . Traffic could turn left between the parkway and connectors, crossing oncoming traffic, so it was not a controlled-access highway (or "freeway" as later defined by the federal government's Manual on Uniform Traffic Control Devices ). Modern controlled-access highways originated in
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#17327724347952948-609: A reduction in deaths in a range from 20% to 50% on those sections. Speed, in Europe, is considered to be one of the main contributory factors to collisions. Some countries, such as France and Switzerland, have achieved a death reduction by a better monitoring of speed. Tools used for monitoring speed might be an increase in traffic density; improved speed enforcement and stricter regulation leading to driver license withdrawal; safety cameras; penalty point; and higher fines. Some other countries use automatic time-over-distance cameras (also known as section controls ) to manage speed. Fatigue
3082-541: A separate roadway or altogether eliminates it. In some parts of the world, notably parts of the US , frontage roads form an integral part of the freeway system. These parallel surface roads provide a transition between high-speed "through" traffic and local traffic. Frequent slip-ramps provide access between the freeway and the frontage road, which in turn provides direct access to local roads and businesses. Except on some two-lane freeways (and very rarely on wider freeways),
3216-604: A series of ridges that face Lake Coeur d'Alene , crossing an arm of the lake on the Veterans Memorial Centennial Bridge . The freeway continues east across Fourth of July Summit and descends into the Silver Valley, where it follows the Coeur d'Alene River through several small towns along the historic Mullan Road . I-90 serves the cities of Kellogg and Wallace before it ascends into
3350-591: A series of tunnels under 14 acres (5.7 ha) of parkland, including Aubrey Davis Park . The freeway continues from the island and enters Bellevue , the largest city of the Eastside region, and intersects I-405 near Factoria . I-90 then travels along Lake Sammamish and through Issaquah as it leaves the Seattle metropolitan area and ascends into the Cascade Range on the Mountains to Sound Greenway ,
3484-926: A set of reversible express lanes that travel for 6.2 miles (10.0 km) toward the Near West Side . The Kennedy Expressway travels south through the Near West Side, opposite the Chicago River from the Chicago Loop (the city's central business district), and intersects I-290 again at the Jane Byrne Interchange . The freeway continues onto the Dan Ryan Expressway and crosses the Chicago River near Chinatown and an interchange with I-55 . The Dan Ryan
3618-406: A short count on a road segment at a minimum of every three years. There are many methods used to calculate an AADT from a short-term count, but most methods attempt to remove seasonal and day-of-week biases during the collection period by applying factors created from associated continuous counters. Short counts are taken either by state agencies, local government, or contractors. For the years when
3752-847: A short spur route near Buffalo that is not directly connected to I-90, is the highest number given to an Interstate. I-90 in Massachusetts is concurrent with the entirety of the Massachusetts Turnpike (also known as "the Pike" or "MassPike"). The turnpike begins at the New York state line in West Stockbridge and travels southeast through the Berkshires to the Pioneer Valley . The highway travels through
3886-510: A similar system of express and local lanes for a maximum width of 21 lanes on a 2-mile (3.2 km) segment between Interstate 805 and California State Route 56 . In Mississauga , Ontario, Highway 401 uses collector-express lanes for a total of 18 lanes through its intersection with Highway 403 / Highway 410 and Highway 427 . These wide freeways may use separate collector and express lanes to separate through traffic from local traffic, or special high-occupancy vehicle lanes , either as
4020-411: A special restriction on the innermost lane or a separate roadway, to encourage carpooling . These HOV lanes , or roadways open to all traffic, can be reversible lanes , providing more capacity in the direction of heavy traffic, and reversing direction before traffic switches. Sometimes a collector/distributor road , a shorter version of a local lane, shifts weaving between closely spaced interchanges to
4154-782: A toll-free alternative to the New York Thruway, was completed in 1976 with a connection to the Berkshire Connector, which had been originally intended to carry the I-90 designation across the Hudson River. South Dakota completed its final section in November 1976, which created an unbroken stretch of four-lane highway from the Wyoming state line to Boston but some intersections remained. The Minnesota segment of I-90
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4288-670: A traffic count is not recorded, the AADT is often estimated by applying a factor called the Growth Factor. Growth Factors are statistically determined from historical data of the road segment. If there is no historical data, Growth Factors from similar road segments are used. The 1992 Edition of the AASHTO Guidelines is out of date. The current edition is from 2018. The Gary Davis article was published in Transportation Research Record 1593, 1997.
4422-628: Is a rate. The VMT is summed and is used as an indicator of the amount of traffic a state has. For federal funding, formulas are applied to include the VMT and other highway statistics. In the United Kingdom , AADT is one of a number of measures of traffic used by local highway authorities, National Highways , and the Department for Transport to forecast maintenance needs and expenditure. To measure AADT on individual road segments, traffic data
4556-456: Is collected by an automated traffic counter , hiring an observer to record traffic or licensing estimated counts from GPS data providers. There are two different techniques of measuring the AADTs for road segments with automated traffic counters. One technique is called continuous count data collection method. This method includes sensors that are permanently embedded into a road and traffic data
4690-497: Is considered as a risk factor more specific to monotonous roads such as motorways, although such data are not monitored/recorded in many countries. According to Vinci Autoroutes , one third of accidents in French motorways are due to sleepy driving. Annual average daily traffic AADT is the standard measurement for vehicle traffic load on a section of road, and the basis for some decisions regarding transport planning , or to
4824-735: Is controlled mainly by two-way stop signs which do not impose significant interruptions on traffic using the main highway. Roundabouts are often used at busier intersections in Europe because they help minimize interruptions in flow, while traffic signals that create greater interference with traffic are still preferred in North America. There may be occasional interchanges with other major arterial roads. Examples include US 23 between SR 15 's eastern terminus and Delaware, Ohio , along with SR 15 between its eastern terminus and I-75 , US 30 , SR 29 / US 33 , and US 35 in western and central Ohio. This type of road
4958-567: Is instead provided through a nearby junction with US 20. I-80/I-90 then continues southeast across the Maumee River to Rossford on the southern outskirts of Toledo, where it intersects I-75 . The turnpike travels southeast through a rural area near the southwest shore of Lake Erie , where it passes the cities of Fremont and Sandusky . Near Norwalk, the highway turns northeast to follow State Route 2 (SR 2) and heads to Elyria , where I-90 splits from I-80 (which remains on
5092-412: Is measured for the entire 365 days. The AADT is the sum of the total traffic for the entire year divided by 365 days. There can be problems with calculating the AADT with this method. For example, if the continuous count equipment is not operating for the full 365 days due to maintenance or repair. Because of this issue, seasonal or day-of-week biases might skew the calculated AADT. In 1992, AASHTO released
5226-655: Is necessary to exit onto a surface road to transfer from one freeway to another. One example in the United States (notorious for the resulting congestion) is the connection from Interstate 70 to the Pennsylvania Turnpike ( Interstate 70 and Interstate 76 ) through the town of Breezewood, Pennsylvania . Speed limits are generally higher on freeways and are occasionally nonexistent (as on much of Germany's Autobahn network). Because higher speeds reduce decision time, freeways are usually equipped with
5360-450: Is not lower than 50 km/h [31 mph] and the maximum speed is not higher than 130 km/h [81 mph] (except Germany where no speed limit is defined). Motorways are designed to carry heavy traffic at high speed with the lowest possible number of accidents. They are also designed to collect long-distance traffic from other roads, so that conflicts between long-distance traffic and local traffic are avoided. According to
5494-431: Is provided with separate carriageways for the two directions of traffic). Principal arterials may cross through urban areas, serving suburban movements. The traffic is characterized by high speeds and full or partial access control (interchanges or junctions controlled by traffic lights). Other roads leading to a principal arterial are connected to it through side collector roads. In this view, CARE's definition stands that
Interstate 90 - Misplaced Pages Continue
5628-702: Is served by spur route I-190 , and passes Ellsworth Air Force Base while it continues east across the plains. I-90 splits from US 14 near Wall , home to the Wall Drug roadside attraction and located northeast of Badlands National Park . The freeway travels southeast into the Buffalo Gap National Grassland and also passes a pair of decommissioned missile silos that form the Minuteman Missile National Historic Site . I-90 continues east along
5762-407: Is sometimes called an expressway . Freeways are usually limited to motor vehicles of a minimum power or weight; signs may prohibit cyclists , pedestrians and equestrians and impose a minimum speed. It is possible for non-motorized traffic to use facilities within the same right-of-way, such as sidewalks constructed along freeway-standard bridges and multi-use paths next to freeways such as
5896-480: Is specially sign-posted as a motorway and is reserved for specific categories of road motor vehicles." Urban motorways are also included in this definition. However, the respective national definitions and the type of roads covered may present slight differences in different EU countries. The first version of modern controlled-access highways evolved during the first half of the 20th century. The Long Island Motor Parkway on Long Island , New York , opened in 1908 as
6030-553: Is the longest Interstate Highway in the United States, spanning 3,021 miles (4,862 km) across the northern portion of the coterminous part of the country. The transcontinental freeway passes through 13 states in the Pacific Northwest , Mountain West , Great Plains , Midwest , and the Northeast regions of the United States. From the Wisconsin – Illinois state line to Massachusetts , approximately 760 miles (1,220 km) of I-90 uses turnpikes and other tolled highways with
6164-545: Is the result of several changes, including infrastructure safety and road user behavior (speed or seat belt use), while other matters such as vehicle safety and mobility patterns have an impact that has not been quantified. Motorways are the safest roads by design. While accounting for more than one quarter of all kilometres driven, they contributed only 8% of the total number of European road deaths in 2006. Germany's Federal Highway Research Institute provided International Road Traffic and Accident Database (IRTAD) statistics for
6298-656: Is the widest section of I-90, at 12 through lanes, and is split between local and express lanes . I-90/I-94 is joined by the "L" Red Line in the median of the expressway through the city's South Side , where it passes Guaranteed Rate Field , the Illinois Institute of Technology campus, and Washington Park . I-90 splits from the Dan Ryan Expressway in Englewood and turns southeast onto the tolled Chicago Skyway . The tolled Skyway travels towards
6432-408: Is two lanes, but work has begun to make all of it four-lane.) These are often called Super two roads. Several such roads are infamous for a high rate of lethal crashes; an outcome because they were designed for short sight distances (sufficient for freeways without oncoming traffic, but insufficient for the years in service as two-lane road with oncoming traffic). An example of such a "Highway to Hell"
6566-717: The Alberton Gorge and crosses the Clark Fork River several times before it reaches the head of the Missoula Valley . After a short concurrency with US 93 , I-90 runs along the north side of Missoula and joins US 12 to continue southeast along the foothills of the Garnet Range and Sapphire Mountains . After it splits from US 12 in Garrison , the freeway turns south to traverse
6700-662: The Bitterroot Range and crosses Lookout Pass , which also marks the Montana state line. Montana has the longest section of I-90, at almost 552 miles (888 km), despite the highway only serving a portion of the state's east–west width. It descends from Lookout Pass along the St. Regis and Clark Fork rivers between the foothills of the Bitteroot Range and Coeur d'Alene Mountains . The freeway travels east through
6834-580: The Buffalo area, where the toll road runs north–south through Cheektowaga and forms an eastern bypass, using auxiliary routes I-190 and I-290 to serve the city. At a junction with I-290 near Buffalo Niagara International Airport , I-90 turns east to follow the historic Water Level Route of the New York Central Railroad , itself parallel to the 19th-century Erie Canal . The Thruway passes south of Rochester , which it serves via
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#17327724347956968-636: The Cascade Range in Washington and the Rocky Mountains in Montana . It then traverses the northern Great Plains and travels southeast through Wisconsin and the Chicago area by following the southern shore of Lake Michigan . The freeway continues across Indiana and follows the shore of Lake Erie through Ohio and Pennsylvania to Buffalo. I-90 travels across New York by roughly following
7102-428: The Cleveland Memorial Shoreway until they split again in Euclid . I-90 briefly turns southeast but resumes its northeastern route after a junction with I-271 in Willoughby Hills . The freeway travels parallel to the Lake Erie shoreline through farmland and exurban towns and crosses into Pennsylvania near Conneaut . Within Pennsylvania, I-90 is non-tolled and generally travels northeast around several communities on
7236-575: The Columbia River on the Vantage Bridge and turns northeast to climb the cliffs of the Columbia Plateau near George . After traveling east across Moses Lake and the surrounding agricultural region, I-90 begins a long concurrency with US 395 at Ritzville as the highways turn northeast towards Spokane . I-90/US 395 is joined by US 2 through western Spokane, where it intersects US 195 . The freeway crosses downtown Spokane on an elevated viaduct and splits from US 2 and US 395 to continue east across Spokane Valley towards
7370-450: The Dartford Crossing (the furthest downstream public crossing of the River Thames ) or where it was not economic to build a motorway alongside the existing road such as the former Cumberland Gap . The A1 is a good example of piece-wise upgrading to motorway standard—as of January 2013, the 639-kilometre-long (397 mi) route had five stretches of motorway (designated as A1(M)), reducing to four stretches in March 2018 with completion of
7504-402: The Deer Lodge Valley . It then turns east to serve Butte , where it overlaps with I-15 for eight miles (13 km) and intersects I-115 . I-90 then continues southeast and crosses the Rocky Mountains and Continental Divide at Homestake Pass , which is the highest point on the entire Interstate at 6,329 feet (1,929 m). The freeway travels east across the Jefferson Valley and passes
7638-435: The Devils Tower . I-90/US 14 then continues northeast to Beulah , where it enters South Dakota . I-90/US 14 enters South Dakota near Spearfish and travels east through prairie land, where it is briefly concurrent with US 85 . Beyond Sturgis , the freeway turns south and follows the edge of the Black Hills to Rapid City , the gateway to Mount Rushmore . It then skirts the northern edge of Rapid City, which
7772-467: The Innerbelt Freeway and crosses the Cuyahoga River into Downtown Cleveland on the George V. Voinovich Bridges . The Innerbelt skirts the south side of Downtown Cleveland, where it intersects I-77 near Progressive Field and turns north to bisect the Goodrich–Kirtland Park neighborhood. Near Cleveland Burke Lakefront Airport , the freeway makes a sharp, 90-degree turn (nicknamed " Dead Man's Curve " for its frequent crashes) and rejoins SR 2 on
7906-401: The Jane Addams Memorial Tollway through the eastern outskirts of Rockford , where the highways split off. I-90 continues on the tollway as it follows US 20 southeast through Belvidere and Elgin in the Fox Valley . The tollway cuts through the northwestern suburbs of Chicago, where it intersects I-290 in Schaumburg and passes the north side of O'Hare International Airport . On
8040-468: The Mount Baker Ridge Tunnel alongside the future 2 Line of the Link light rail system, set to open in 2025. I-90 emerges from the tunnel on a pair of floating bridges , among the longest of their kind: the eastbound-only Lacey V. Murrow Memorial Bridge and the Homer M. Hadley Memorial Bridge , which carries westbound traffic and the future light rail line. The floating bridges cross Lake Washington to Mercer Island , where I-90 travels through
8174-544: The Seaport District . The turnpike then enters the Ted Williams Tunnel , which travels northeast under Boston Harbor to the passenger terminals at Logan International Airport . After it passes the northwest side of the airport, I-90 terminates at an interchange with Route 1A in East Boston . The section between I-93 and the airport was opened in the early 2000s as part of the Big Dig megaproject, which rebuilt several Boston freeways and extended I-90 by 3.5 miles (5.6 km). An east–west controlled access highway to serve
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#17327724347958308-575: The Suncoast Trail along the Suncoast Parkway in Florida . In some US jurisdictions, especially where freeways replace existing roads, non-motorized access on freeways is permitted. Different states of the United States have different laws. Cycling on freeways in Arizona may be prohibited only where there is an alternative route judged equal or better for cycling. Wyoming , the second least densely populated state, allows cycling on all freeways. Oregon allows bicycles except on specific urban freeways in Portland and Medford . In countries such as
8442-475: The United Kingdom new motorways require an Act of Parliament to ensure restricted right of way. Since upgrading an existing road (the "King's Highway") to a full motorway will result in extinguishing the right of access of certain groups such as pedestrians, cyclists and slow-moving traffic, many controlled access roads are not full motorways. In some cases motorways are linked by short stretches of road where alternative rights of way are not practicable such as
8576-424: The United Kingdom , do not distinguish between the two, but others make a distinction; for example, Germany uses the words Kreuz ("cross") or Dreieck ("triangle") for the former and Ausfahrt ("exit") for the latter. In all cases one road crosses the other via a bridge or a tunnel, as opposed to an at-grade crossing . The inter-connecting roads, or slip-roads , which link the two roads, can follow any one of
8710-490: The shoulder at regular intervals. In the United States, mileposts usually start at the southern or westernmost point on the freeway (either its terminus or the state line). California , Ohio and Nevada use postmile systems in which the markers indicate mileage through the state's individual counties. However, Nevada and Ohio also use the standard milepost system concurrently with their respective postmile systems. California numbers its exits off its freeways according to
8844-448: The "world's widest freeway" at the time. In 1965, the designation for I-90 was switched with I-94 south of Chicago, which moved it to the tolled Chicago Skyway (completed in 1958); the change was requested by the Illinois and Indiana state governments to avoid confusion and provide a continuous toll connection to the Indiana Toll Road, which had been fully opened in 1956. I-90 was moved onto the Kennedy Expressway in 1977 and its western route
8978-487: The 1910s along the future route of I-90 between Seattle and Boston. The national numbered highways along the corridor included US 10 from Seattle to Billings, Montana; US 87 from Billings to Buffalo, Wyoming ; US 16 from Buffalo to Portage, Wisconsin ; US 51 from Portage to Rockford, Illinois and US 20 from Rockford to Boston. Major portions of I-90 in the Midwest and Northeastern states used existing toll roads built by state governments in
9112-402: The 1950s and 1960s. The Northwest Tollway , Chicago Skyway , Indiana Toll Road , Ohio Turnpike , New York State Thruway , and Massachusetts Turnpike all predate I-90 and were incorporated into the route. This also meant that portions of the route did not adhere to Interstate Highway standards , but they were either deemed adequate or rebuilt to conform by the 1980s. The Pennsylvania section
9246-424: The 1950s and were followed by toll-free sections in Pennsylvania and Wisconsin that were finished in the 1960s. The Midwestern sections of I-90 were fully completed in 1978, and most of the route between Seattle and South Dakota opened by 1987. The final section, near the western terminus in Seattle, opened in September 1993; an eastern extension in Boston was completed in 2003 as part of the Big Dig project. I-90
9380-450: The A1(M) through North Yorkshire . The most frequent way freeways are laid out is by building them from the ground up after obstructions such as forestry or buildings are cleared away. Sometimes they deplete farmland, but other methods have been developed for economic, social and even environmental reasons. Full freeways are sometimes made by converting at-grade expressways or by replacing at-grade intersections with overpasses; however, in
9514-491: The AADWs are averaged to calculate an AADT. The United States Federal Highway Administration (FHWA) has adopted this method as the preferred method in the FHWA Traffic Monitoring Guide. While providing the most accurate AADT, installing and maintaining continuous count stations method is costly. Most public agencies are only able to monitor a very small percentage of the roadway using this method. Most AADTs are generated using short-term data collection methods sometimes known as
9648-399: The AASHTO Guidelines for Traffic Data Programs, which identified a way to produce an AADT without seasonal or day-of-week biases by creating an "average of averages." For every month and day-of-week, a Monthly Average Day of Week (MADW) is calculated (84 per year). Each day-of-week's MADW is then calculated across months to calculate an Annual Average Day of Week (AADW) (7 per year). Finally,
9782-973: The Albany area by the end of the year. It was extended to the Pennsylvania state line in 1957 and to the Massachusetts Turnpike via the Berkshire Connector in 1959. The Berkshire section linked with the Massachusetts Turnpike, which had opened in 1957 from the state line to Newton, a distance of 123 miles (198 km). The turnpike was extended into Boston in two stages: first by 9 miles (14 km) from Newton to Allston in September 1964; and finally with an extension to I-93 near South Station in Downtown Boston that opened on February 18, 1965. The freeway also incorporated other non-tolled expressway bypasses planned by state governments in
9916-616: The Erie Canal). The section through Utica, connected to the city's downtown via I-790 , was built between the lines of SR 49 , which does not merge with the Thruway. I-90 then closely follows the Mohawk River southeast through several towns and villages between the foothills of the Catskill and Adirondack mountains. The Thruway then reaches Schenectady , which it bypasses to the southwest and intersects I-88 and I-890 ,
10050-687: The Idaho state line. I-90 traverses the Idaho Panhandle region at the north end of the state, where it connects Coeur d'Alene to communities in the Silver Valley . From the Washington state line, the freeway follows the Spokane River through Post Falls and Huetter to the city of Coeur d'Alene, where it intersects US 95 , the state's main north–south highway. I-90 then turns southeast to bypass Coeur d'Alene and travel along
10184-962: The Indiana state line, which the freeway crosses near the Calumet River in the East Side . The entirety of I-90 within Indiana is concurrent with the Indiana Toll Road , which crosses the state's northern fringe and is mostly shared with I-80 . From the Illinois state line, the tollway travels south through Hammond and turns east to follow the Grand Calumet River through northern Gary , where it intersects US 41 and US 12. I-90 then crosses I-65 in eastern Gary and I-94 in Lake Station , where it begins
10318-660: The Lake Erie shoreline and remains entirely in Erie County . It enters the state in Springfield Township and passes through rural areas along the lake shore, parallel to US 20 and the Lake Road . The freeway then travels through the southern outskirts of Erie , where it intersects I-79 and US 19 . I-90 returns to the rural areas of northeastern Erie County and intersects I-86 before it reaches
10452-707: The Mississippi River on the Dresbach Bridge into Wisconsin. I-90 enters Wisconsin near La Crosse and bisects French Island before it reaches Onalaska . This section is briefly concurrent to US 53 between La Crosse and Onalaska. The freeway travels east, generally along the La Crosse River , through several towns and Fort McCoy before it reaches a junction with I-94 in Tomah . The two Interstates join at Tomah and travel southeast along
10586-508: The New York state line near the borough of North East . At 46 miles (74 km), the Pennsylvania section is I-90's shortest within a single state. I-90 enters New York in Chautauqua County and runs concurrently with the mainline of the tolled New York State Thruway . It travels northeast along the Lake Erie shoreline between Lake Road to the north and US 20 to the south through Dunkirk and Fredonia . The highways enter
10720-612: The Northern United States was proposed in the early 20th century in several federal government documents, including reports from the Bureau of Public Roads in the 1930s and 1940s. The Interstate Highway System was created by the Federal-Aid Highway Act of 1956 , which was approved by the U.S. Congress and signed into law on June 26, 1956. I-90 was assigned to the northernmost transcontinental route in
10854-481: The Seattle–Bellevue section. The Snoqualmie Pass section was completed in 1981 with a viaduct for westbound traffic that stands 150 feet (46 m) over Denny Creek. The viaduct replaced an earlier plan for a ground-level freeway at the behest of environmentalists; the Mountains to Sound Greenway was established in 1990 along the corridor between Seattle and Thorp to preserve wilderness and recreational areas and
10988-612: The Thruway via the Berkshire Connector , which continues east into the Taconic Mountains toward the Massachusetts state line. The mileposts and sequential exit numbers on the New York State Thruway mainline originate from New York City, increasing northward on I-87 and westward on I-90; as a result, the mileposts and exit numbers on I-90 through most of New York run backwards compared to
11122-409: The US, any at-grade intersection that ends a freeway often remains an at-grade intersection. Often, when there is a two-lane undivided freeway or expressway, it is converted by constructing a parallel twin corridor, and leaving a median between the two travel directions. The median-side travel lane of the old two-way corridor becomes a passing lane. Other techniques involve building a new carriageway on
11256-484: The United States, allow for limited exceptions: some movable bridges , for instance the Interstate Bridge on Interstate 5 between Oregon and Washington , do require drivers to stop for ship traffic. The crossing of freeways by other routes is typically achieved with grade separation either in the form of underpasses or overpasses . In addition to sidewalks (pavements) attached to roads that cross
11390-712: The Vienna Convention. Exits are marked with another symbol: [REDACTED] . The definitions of "motorway" from the OECD and PIARC are almost identical. In the European Union , for statistical and safety purposes, some distinction might be made between motorway and expressway . For instance a principal arterial might be considered as: Roads serving long distance and mainly interurban movements. Includes motorways (urban or rural) and expressways (road which does not serve properties bordering on it and which
11524-835: The Yellowstone River through Billings , overlapping with US 87 and US 212 , until it reaches Lockwood , the western terminus of I-94 . The freeways split and I-90 continues east across the Bighorn Basin before it turns south near Hardin to follow the Little Bighorn River into the Crow Indian Reservation . The highway passes the site of the Battle of the Little Bighorn near Crow Agency and continues south along
11658-793: The bridge. The Queen Elizabeth II Bridge / Dartford tunnel at London Orbital is an example of this. London Orbital or the M25 is a motorway surrounding London , but at the last River Thames crossing before its mouth, motorway rules do not apply. (At this crossing the London Orbital is labeled A282 instead.) A few of the more common types of junction are shown below: There are many differences between countries in their geography, economy, traffic growth, highway system size, degree of urbanization and motorization, etc.; all of which need to be taken into consideration when comparisons are made. According to some EU papers, safety progress on motorways
11792-600: The city. East of Madison, I-94 separates from I-39/I-90, which continues southeast through Edgerton and Janesville . The highway turns south and enters Beloit , where it intersects I-43 and crosses into Illinois . I-90 uses several sections of the Illinois Tollway system as it traverses the northeastern corner of the state, primarily in the Chicago metropolitan area . It enters the state from Beloit, Wisconsin, and remains concurrent to I-39 and US 51 on
11926-492: The common European definition, a motorway is defined as "a road, specially designed and built for motor traffic, which does not serve properties bordering on it, and which: (a) is provided, except at special points or temporarily, with separate carriageways for the two directions of traffic, separated from each other, either by a dividing strip not intended for traffic, or exceptionally by other means; (b) does not cross at level with any road, railway or tramway track, or footpath; (c)
12060-529: The completion of Montana's cross-border section. The last two-lane section in Montana, near Springdale , was widened to four lanes in May 1987. One of the last rural sections of I-90 to be built was through Wallace, Idaho , which placed its downtown on the National Register of Historic Places in 1976 to prevent its demolition for the freeway. The 1.5-mile (2.4 km) elevated freeway bypassed Wallace to
12194-461: The coverage count data collection method. Traffic is collected with portable sensors that are attached to the road and record traffic data typically for 2 – 14 days. These are typically pneumatic road tubes although other more expensive technology such as radar, laser, or sonar exist. After recording the traffic data, the traffic counts on the same road segment are taken again in another three years. The FHWA Traffic Monitoring Guide recommends performing
12328-692: The earliest of which was the Tri-State Expressway (now the Kingery Expressway), completed in 1950 and extended into Indiana the following year. It was followed by the Congress Expressway in the western suburbs, first opened in 1955, and the Northwest Tollway in 1958. The last section to be completed in Illinois was the toll-free Dan Ryan Expressway , which opened on December 15, 1962, and was described as
12462-517: The early 1920s in response to the rapidly increasing use of the automobile , the demand for faster movement between cities and as a consequence of improvements in paving processes, techniques and materials. These original high-speed roads were referred to as " dual highways " and have been modernized and are still in use today. Italy was the first country in the world to build controlled-access highways reserved for fast traffic and for motor vehicles only. The Autostrada dei Laghi ("Lakes Motorway"),
12596-651: The early 1950s and modified to meet Interstate standards. A bypass of Spokane Valley, Washington, opened in November 1956 as the first section in Washington and was extended into neighboring Spokane two years later. Wisconsin opened their first section in November 1959, connecting the terminus of the Illinois Tollway with Janesville, and extended the freeway through the Madison area to Wisconsin Dells in 1962. The Cleveland Innerbelt opened in stages from 1959 to 1962 and
12730-679: The east side of the airport in Rosemont , I-90 intersects I-294 and I-190 , the latter of which serves the airport's passenger terminals and marks the end of the tollway. The freeway, now named the Kennedy Expressway , travels through northwestern Chicago, where the Blue Line of the "L" rapid transit system runs in the median and serves several stops. I-90 turns southeast and is rejoined by I-94 in Irving Park , where it gains
12864-698: The edge of the hills of the Western Upland , following the Lemonweir and Wisconsin rivers. It passes Wisconsin Dells , situated on the gorge of the same name and home to several water parks and theme parks . The freeway travels east from Wisconsin Dells to the Portage area, where I-39 begins its concurrency with I-90/I-94. The highway then crosses the Wisconsin River and travels south towards Madison , where it forms an eastern bypass of
12998-407: The environmental hazards of pollution related to road transport. One of the most important uses of AADT is for determining funding for the maintenance and improvement of highways. In the United States, the amount of federal funding a state will receive is related to the total traffic measured across its highway network. Each year on June 15, every state's department of transportation (DOT) submits
13132-576: The exception of segments in Chicago , northeastern Ohio, Pennsylvania , and Albany, New York . The toll road sections comprise 25 percent of the freeway's total length. According to 2011 data from the Federal Highway Administration , the busiest section of I-90 is in the Chicago area, where a daily average of 306,574 vehicles use the freeway. The lowest daily traffic counts on I-90 were recorded in Wyoming, where an average of 9,820 vehicles used rural sections of
13266-471: The federal preference for mile-based numbers increasing from west to east. The Berkshire Connector uses west-to-east mileposts and exit numbers with a "B" prefix; the toll-free section of I-90 through Albany and Rensselaer uses conventional west-to-east mileposts and exit numbers despite being geographically north–south. I-90 is currently the only Interstate that has a complete set of nine spur routes within one state, all numbers being used. In addition, I-990 ,
13400-485: The first built in the world, connecting Milan to Lake Como and Lake Maggiore , and now parts of the A8 and A9 motorways, was devised by Piero Puricelli and was inaugurated in 1924. This motorway, called autostrada , contained only one lane in each direction and no interchanges. The Bronx River Parkway was the first road in North America to utilize a median strip to separate the opposing lanes, to be constructed through
13534-412: The first half of the 20th century. Italy was the first country in the world to build controlled-access highways reserved for fast traffic and for motor vehicles only. Italy opened its first autostrada in 1924, A8 , connecting Milan to Varese . Germany began to build its first controlled-access autobahn without speed limits (30 kilometres [19 mi] on what is now A555 , then referred to as
13668-703: The freeway travels east across farmland and towns in the plains and rolling hills of the Buffalo Ridge . It also intersects several north–south highways, including US 75 in Luverne , US 59 in Worthington , US 71 in Jackson , and US 169 in Blue Earth . I-90 travels around the northern outskirts of Albert Lea and intersects I-35 northeast of the city. It then reaches Austin and
13802-512: The freeway. The western terminus of I-90 is at an intersection with Washington State Route 519 and 4th Avenue South in the SoDo neighborhood of Seattle . The junction is south of Downtown Seattle , adjacent to the Port of Seattle and two major sports stadiums, Lumen Field and T-Mobile Park . The freeway travels east through an interchange with I-5 and around Beacon Hill before it enters
13936-729: The headwaters of the Missouri River near Three Forks . It then enters the Gallatin Valley . I-90 travels around Bozeman , where it is joined by US 191 , and crosses Bozeman Pass between the Bridger and Gallatin mountains. At the east end of the mountains, the freeway begins to follow the Yellowstone River and is briefly concurrent with US 89 , which serves Yellowstone National Park , and splits from US 191 at Big Timber . I-90 continues along
14070-504: The highway are provided at interchanges by slip roads (ramps), which allow for speed changes between the highway and arterials and collector roads . On the controlled-access highway, opposing directions of travel are generally separated by a median strip or central reservation containing a traffic barrier or grass. Elimination of conflicts with other directions of traffic dramatically improves safety, while increasing traffic capacity and speed. Controlled-access highways evolved during
14204-479: The historic Erie Canal and traverses Massachusetts , reaching its eastern terminus at Massachusetts Route 1A near Logan International Airport in Boston. The freeway was established by the Federal-Aid Highway Act of 1956 , replacing a series of existing U.S. highways that had been preceded by local roads and auto trails established in the early 20th century. I-90 was numbered in 1957, reflecting its status as
14338-463: The latter of which serves the city's downtown. The highway continues southeast into Albany to a junction with I-87 , where I-90 splits from the Thruway, which turns south to serve New York City . I-90 travels east as a toll-free freeway through the northern neighborhoods of Albany and intersects I-787 before it crosses the Hudson River . The freeway travels south around Rensselaer and rejoins
14472-655: The main beltway around Boston, on the border of Weston and Newton . The turnpike continues along the Charles River into Boston, where it descends into a tunnel that passes Boston University , Fenway Park , and under the Prudential Tower complex in the Back Bay neighborhood. I-90 intersects I-93 on the south side of Downtown Boston and travels under the Fort Point Channel to serve
14606-469: The mayor of Cologne . The German Autobahn became the first nationwide highway system. In Canada , the first precursor with semi-controlled access was The Middle Road between Hamilton and Toronto , which featured a median divider between opposing traffic flow, as well as the nation's first cloverleaf interchange . This highway developed into the Queen Elizabeth Way , which featured
14740-400: The motorway system, whilst a junction is a crossing between motorways or a split/merge of two motorways. The motorway rules end at exits, but not at junctions. However, on some bridges, motorways, without changing appearance, temporarily end between the two exits closest to the bridge (or tunnel), and continue as dual carriageways . This is in order to give slower vehicles a possibility to use
14874-593: The north and cost $ 42 million (equivalent to $ 84 million in 2023 dollars) to construct. It opened on September 5, 1991, and the city ceremonially retired the last stoplight on I-90 a week later. The Idaho section was declared fully complete in July 1992 after the Veterans Memorial Centennial Bridge opened near Coeur d'Alene. Washington was the last state to complete its section of I-90, primarily due to disputes and litigation over
15008-490: The northern suburbs of Springfield , where it intersects I-91 and crosses the Connecticut River into Chicopee . I-90 then crosses over I-391 without an interchange and serves as the northern terminus of I-291 on the eastern outskirts of the city. The turnpike continues east through the hills of Central Massachusetts and serves as the eastern terminus of I-84 in the town of Sturbridge . From Sturbridge,
15142-654: The northernmost transcontinental route of the system, and construction was underway on several sections with funding from the Federal-Aid Highway Act. The route also incorporates several toll roads that predate the Interstate Highway System, including the Jane Addams Memorial Tollway , Indiana Toll Road , Ohio Turnpike , New York State Thruway , and the Massachusetts Turnpike . These toll roads opened in
15276-439: The other. Other methods involve constructing a service drive that shortens the long driveways (typically by less than 100 metres (330 ft)). An interchange or a junction is a highway layout that permits traffic from one controlled-access highway to access another and vice versa, whereas an access point is a highway layout where traffic from a distributor or local road can join a controlled-access highway. Some countries, such as
15410-550: The plains and past several small towns near the city of Mitchell . It then reaches the Sioux Falls area, where it bypasses the city to the north and intersects I-29 and I-229 . I-90 leaves Sioux Falls and crosses into Minnesota near Brandon . I-90 crosses the southern portion of Minnesota and carries unsigned Legislative Route 391 across the state. From the South Dakota border near Beaver Creek to Albert Lea ,
15544-477: The rate is higher than the risk on urban roads. Speeds are higher on rural roads and autobahns than urban roads, increasing the severity potential of a crash. According to ETSC, German motorways without a speed limit, but with a 130 km/h (81 mph) speed recommendation, are 25% more deadly than motorways with a speed limit. Germany also introduced some 130 km/h (81 mph) speed limits on various motorway sections that were not limited. This generated
15678-643: The rights of light , air and access to highways, but not parkways and freeways; the latter two are distinguished in that the purpose of a parkway is recreation, while the purpose of a freeway is movement. Thus, as originally conceived, a freeway is simply a strip of public land devoted to movement to which abutting property owners do not have rights of light, air or access. Freeways, by definition, have no at-grade intersections with other roads, railroads or multi-use trails . Therefore, no traffic signals are needed and through traffic on freeways does not normally need to stop at traffic signals. Some countries, such as
15812-608: The river and the Wolf Mountains into Wyoming. From 1995 to 1999, there was no numbered daytime speed limit on rural highways in Montana, including I-90. The speed limit was simply defined as "reasonable and proper" as determined on a case-by-case basis by the Montana Highway Patrol until the Montana Supreme Court ruled it was unconstitutional. The maximum daytime speed limit in Montana
15946-432: The side of a divided highway that has a lot of private access on one side and sometimes has long driveways on the other side since an easement for widening comes into place, especially in rural areas. When a third carriageway is added, sometimes it can shift a directional carriageway by 20–60 metres (50–200 ft) (or maybe more depending on land availability) as a way to retain private access on one side that favors over
16080-710: The state line until it reaches an interchange with I-69 near Fremont , where it turns southeast. The tollway then turns east and crosses the Ohio state line near Angola . At the state line near Montpelier , I-80/I-90 transitions from the Indiana Toll Road to the Ohio Turnpike , which crosses northern Ohio. The highway continues east around several rural towns as it approaches the Toledo area. The turnpike crosses under I-475 in Maumee without an interchange; access to I-475
16214-461: The system by the American Association of State Highway Officials in 1957. The freeway would travel along existing parts of the United States Numbered Highway System , which was established at the suggestion of the federal government in 1926 to replace the named auto trails . Among these auto trails, which were generally designated by private motorist organizations, were the transcontinental Yellowstone Trail and National Parks Highway , created in
16348-458: The top of a plateau that faces the White River and passes near Kadoka and Murdo . US 83 briefly joins the highway from Murdo to Vivian , where it splits off to serve the state capital of Pierre . It then crosses the Missouri River on the Lewis and Clark Memorial Bridge near Chamberlain and passes a rest area which overlooks the river and includes the 50-foot (15 m) Dignity statue. From Chamberlain, I-90 continues east across
16482-448: The turnpike travels northeast towards Worcester and passes through the city's southern outskirts. It serves as the respective northern and western terminus of I-395 and I-290 in Auburn , located southwest of Worcester, and continues to an interchange with I-495 near Westborough at the edge of Greater Boston . I-90 travels through the western suburbs of Boston and travels through Framingham before it intersects I-95 / Route 128 ,
16616-488: The turnpike). The freeway then merges with SR 2 and continues northeast through the lakeshore suburbs west of Cleveland , including Rocky River and Lakewood . I-90 and SR 2 separate after crossing the Rocky River and travel parallel to each other as they enter Cleveland. I-90 continues through the southwestern residential neighborhoods of Cleveland and reaches a junction with I-71 and I-490 in Tremont , where it turns north. From Tremont, I-90 turns north onto
16750-406: The year 2010, comparing overall fatality rates with motorway rates (regardless of traffic intensity): The German autobahn network illustrates the safety trade-offs of controlled access highways. The injury crash rate is very low on autobahns, while 22 people died per 1,000 injury crashes—although autobahns have a lower rate than the 29 deaths per 1,000 injury accidents on conventional rural roads,
16884-443: Was European route E4 from Gävle to Axmartavlan , Sweden. The high rate of crashes with severe personal injuries on that (and similar) roads did not cease until a median crash barrier was installed, transforming the fatal crashes into non-fatal crashes. Otherwise, freeways typically have at least two lanes in each direction; some busy ones can have as many as 16 or more lanes in total. In San Diego, California , Interstate 5 has
17018-449: Was declared complete in September 1978 with a dedication at Blue Earth, where a golden line was painted to emulate the golden spike of the first transcontinental railroad . Two months later, Ohio finished its last section west of Cleveland. The western states were the last to complete their segments of I-90. Wyoming opened its final section, from the Montana state line to Sheridan, in July 1985 and dedicated it three months later following
17152-462: Was designated as a National Scenic Byway in 1998, a first for an Interstate Highway. The extension into Seattle was completed in stages between 1989 and 1993 and cost $ 1.56 billion (equivalent to $ 2.97 billion in 2023 dollars) to construct. The project involved construction of a new floating bridge , expansion of the Mount Baker Ridge Tunnel, addition of lids with parks, and extensive mitigation for environmental and social impacts. The project
17286-560: Was initially set at 75 mph (120 km/h) in 1999 and was later raised to 80 mph (130 km/h) in 2015. I-90 serves a portion of northeastern Wyoming that is primarily rural. The freeway, briefly concurrent to US 14 , travels southeast along a series of creeks to Sheridan in the northeastern foothills of the Bighorn Mountains . I-90 and US 87 split in Sheridan and travel parallel to each other to Fort Phil Kearny , where they rejoin and continue south past Lake Desmet to Buffalo . The highways split again near Buffalo at
17420-399: Was originally planned to be completed in 1992, but was delayed a year due to the sinking of the original floating bridge during renovations in November 1990; the bridge was rebuilt and opened for eastbound traffic on September 12, 1993. Extensions at both termini of I-90 were completed in the early 2000s as part of separate projects. The west end at Washington State Route 519 in Seattle
17554-510: Was originally planned to connect with the Parma Freeway , which would have carried I-90 around the northwest side of Downtown Cleveland . It was later cancelled in the 1960s amid public opposition . The first Minnesota section, built to bypass Austin, began construction in 1957 and opened in 1961. Wisconsin was among the first states to complete its rural Interstate system and opened its final section of I-90, from La Crosse to Tomah, in November 1969. The section around Albany, New York, built as
17688-408: Was planned in the early 1950s as the "Erie Extension" of the Pennsylvania Turnpike , but was instead completed as a toll-free road in October 1960 with federal funds. The completion of the section also allowed for full use of the New York State Thruway, which had been finished three years earlier but ended abruptly at the state line. I-90 would use several expressways and tollways in the Chicago area,
17822-459: Was rebuilt as a series of ramps near Safeco Field (now T-Mobile Park) to replace an existing intersection. A component of the Big Dig megaproject in Boston that extended I-90 east by 3.5 miles (5.6 km) under Fort Point Channel and Boston Harbor to Logan International Airport opened on January 18, 2003, at a cost of $ 6.5 billion (equivalent to $ 10.3 billion in 2023 dollars). The Fort Point Channel tunnel later closed in July 2006 due to
17956-409: Was replaced with I-290 from Schaumburg to the Circle Interchange in Chicago. The other tolled sections of I-90 were completed in the 1950s by their respective state governments. The 241-mile (388 km) Ohio Turnpike opened to traffic on October 1, 1955, three years after construction began. The first segment of the New York Thruway opened in June 1954 and was followed by extensions to Buffalo and
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