106-697: Interstate 10 ( I-10 ) is a transcontinental Interstate Highway in the United States, stretching from Santa Monica, California , to Jacksonville, Florida . The segment of I-10 in California, also known as the Pearl Harbor Memorial Highway , runs east from Santa Monica through Los Angeles , San Bernardino , and Palm Springs before crossing into the state of Arizona . In the Greater Los Angeles area, it
212-656: A National Park Service unit in the US national Historic and Millennium trail programs. In 2005, Caltrans began posting signs on roads that overlap with the historic 1776 Juan Bautista de Anza trail route, so that California drivers can now follow the trail. The legislative definition of Route 10 includes a spur from I-5 (the Golden State Freeway ) west to US 101 (the Santa Ana Freeway ) near downtown Los Angeles. This section of roadway,
318-535: A concurrency or overlap. For example, I‑75 and I‑85 share the same roadway in Atlanta ; this 7.4-mile (11.9 km) section, called the Downtown Connector , is labeled both I‑75 and I‑85. Concurrencies between Interstate and US Highway numbers are also allowed in accordance with AASHTO policy, as long as the length of the concurrency is reasonable. In rare instances, two highway designations sharing
424-524: A 1931 cutoff bypassed Mecca to the north.) LR 26 was extended west from San Bernardino to Los Angeles in 1931, running along an alignment south of the existing US 66/US 99. Neither of these was a signed route until around 1932, when US 60 was extended west from Arizona to Los Angeles, running along LR 64 to Indio, LR 26 (with US 99) to Beaumont , pre-1964 LR 19 to Pomona , and LR 26 to Los Angeles. (The original alignment of LR 26 ran roughly where SR 60 now
530-651: A 28-year-old brevet lieutenant colonel, accompanied the trip "through darkest America with truck and tank," as he later described it. Some roads in the West were a "succession of dust, ruts, pits, and holes." As the landmark 1916 law expired, new legislation was passed—the Federal Aid Highway Act of 1921 (Phipps Act). This new road construction initiative once again provided for federal matching funds for road construction and improvement, $ 75 million allocated annually. Moreover, this new legislation for
636-476: A change in the numbering system as a result of a new policy adopted in 1973. Previously, letter-suffixed numbers were used for long spurs off primary routes; for example, western I‑84 was I‑80N, as it went north from I‑80 . The new policy stated, "No new divided numbers (such as I-35W and I-35E , etc.) shall be adopted." The new policy also recommended that existing divided numbers be eliminated as quickly as possible; however, an I-35W and I-35E still exist in
742-592: A couple of days later that "sanitizer accumulated during the height of the COVID-19 pandemic was stored under the overpass and helped fuel the flames". Governor Gavin Newsom declared a state of emergency in response to the fire; the freeway was reopened after eight days, far ahead of the original five-week estimate. The I-10 is part of the auto tour route of the Juan Bautista de Anza National Historic Trail ,
848-586: A formal dedication held in 1966. While the construction of the Century Freeway several miles to the south reduced traffic congestion to a considerable amount by creating an alternate route from downtown to Los Angeles International Airport , the Santa Monica Freeway is still one of the busiest freeways in the world. All three freeway-to-freeway interchanges along its length are notorious for their congestion and are routinely ranked among
954-735: A four-level interchange with I-15 before traveling through Fontana , Rialto , and Colton . I-10 then intersects with I-215 , where the San Bernardino Freeway ends, before briefly entering San Bernardino city proper and traveling through Loma Linda and Redlands . In Redlands, I-10 intersects with the SR ;210 freeway (future I-210) and with SR 38 before entering Yucaipa and eventually Riverside County . In 2019, SBCTA planned to add two more interchanges in Fontana at Beech and Alder Avenues to reduce congestion at
1060-595: A national road grid with the passage of the Federal Aid Highway Act of 1921 . In 1926, the United States Numbered Highway System was established, creating the first national road numbering system for cross-country travel. The roads were state-funded and maintained, and there were few national standards for road design. United States Numbered Highways ranged from two-lane country roads to multi-lane freeways. After Dwight D. Eisenhower became president in 1953, his administration developed
1166-701: A network of highways that are considered essential to the country's economy, defense, and mobility by the FHWA. I-10 is eligible to be included in the State Scenic Highway System , but it is not officially designated as a scenic highway by Caltrans. The Santa Monica Freeway is I-10 from SR 1 to I-5, as named by the State Highway Commission on April 25, 1957. The section between the Harbor (I-110) and San Diego (I-405) freeways
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#17327808180221272-589: A numbering scheme in which primary Interstates are assigned one- or two-digit numbers, and shorter routes which branch off of longer ones are assigned three-digit numbers where the last two digits match the parent route. The Interstate Highway System is partially financed through the Highway Trust Fund , which itself is funded by a combination of a federal fuel tax and transfers from the Treasury's general fund. Though federal legislation initially banned
1378-491: A proposal for an interstate highway system, eventually resulting in the enactment of the Federal-Aid Highway Act of 1956 . Unlike the earlier United States Numbered Highway System, the interstates were designed to be all freeways, with nationally unified standards for construction and signage. While some older freeways were adopted into the system, most of the routes were completely new. In dense urban areas,
1484-498: A rapid change between Mediterranean and desert ecology) and entering Palm Springs . The next 35 miles (56 km) of the freeway, between SR 111 and Dillon Road, was named the Sonny Bono Memorial Freeway in 2002. Although I-10 intersects with the northern terminus of SR 111, the major artery to Palm Springs, it mostly bypasses the city, then connects to SR 62 , a major east–west route through
1590-559: A report called Toll Roads and Free Roads , "the first formal description of what became the Interstate Highway System" and, in 1944, the similarly themed Interregional Highways . The Interstate Highway System gained a champion in President Dwight D. Eisenhower, who was influenced by his experiences as a young Army officer crossing the country in the 1919 Motor Transport Corps convoy that drove in part on
1696-409: A single digit prefixed to the two-digit number of its parent Interstate Highway. Spur routes deviate from their parent and do not return; these are given an odd first digit. Circumferential and radial loop routes return to the parent, and are given an even first digit. Unlike primary Interstates, three-digit Interstates are signed as either east–west or north–south, depending on the general orientation of
1802-801: A speed limit of 45 mph (70 km/h) because it is a parkway that consists of only one lane per side of the highway. On the other hand, Interstates 15, 80, 84, and 215 in Utah have speed limits as high as 70 mph (115 km/h) within the Wasatch Front , Cedar City , and St. George areas, and I-25 in New Mexico within the Santa Fe and Las Vegas areas along with I-20 in Texas along Odessa and Midland and I-29 in North Dakota along
1908-460: A speed limit of 80 mph (130 km/h). Other Interstates in Idaho, Montana, Oklahoma, South Dakota and Wyoming also have the same high speed limits. In some areas, speed limits on Interstates can be significantly lower in areas where they traverse significantly hazardous areas. The maximum speed limit on I-90 is 50 mph (80 km/h) in downtown Cleveland because of two sharp curves with
2014-474: A suggested limit of 35 mph (55 km/h) in a heavily congested area; I-70 through Wheeling, West Virginia , has a maximum speed limit of 45 mph (70 km/h) through the Wheeling Tunnel and most of downtown Wheeling; and I-68 has a maximum speed limit of 40 mph (65 km/h) through Cumberland, Maryland , because of multiple hazards including sharp curves and narrow lanes through
2120-686: A turnoff that leads to Desert Center Airport and connects to SR 62. Three miles (4.8 km) south of I-10 at the Wiley's Well exit, between Desert Center and Blythe, are the Chuckawalla Valley and Ironwood state prisons. Near the Arizona state line, I-10 meets the terminus of SR 78 . In the city of Blythe, I-10 runs concurrently with US 95 as both routes cross the Colorado River into Arizona . The speed limit on
2226-943: A westbound exit off the spur at Mission Road immediately before merging with US 101 northbound, and the eastbound exit for State Street and Soto Street before it merges onto I-10 eastbound—this one is numbered (as exit 19). There is no direct access from the I-10 spur to I-5. Exit list The entire route is in Los Angeles , Los Angeles County . There are three auxiliary Interstate Highways associated with I-10 in California: One business loop of I-10 exists in California, running through Blythe in Riverside County . Interstate Highway System [REDACTED] The Dwight D. Eisenhower National System of Interstate and Defense Highways , commonly known as
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#17327808180222332-552: Is cosigned along this segment, despite the legal definition. The short unsigned section of Route 10 between Route 5 and Route 101, which was formerly defined as Route 110 (signed as I-110) until 1968, carries overhead signage for I-10 eastbound and for US 101 westbound. I-10 is part of the California Freeway and Expressway System and is part of the National Highway System ,
2438-543: Is also commonly believed the Interstate Highway System was built for the sole purpose of evacuating cities in the event of nuclear warfare . While military motivations were present, the primary motivations were civilian. The numbering scheme for the Interstate Highway System was developed in 1957 by the American Association of State Highway and Transportation Officials (AASHTO). The association's present numbering policy dates back to August 10, 1973. Within
2544-890: Is also signed as the Rosa Parks Freeway, after the African-American civil rights activist . The I-10 freeway is signed as the Christopher Columbus Transcontinental Highway in Santa Monica. The removal of this designation, however, may result in the eventual removal of this signage. The Santa Monica Freeway is the westernmost segment of I-10, beginning at the east end of the McClure Tunnel in Santa Monica and ending southeast of Downtown Los Angeles at
2650-660: Is an interchange complex located in Boyle Heights, Los Angeles , approximately 1 mile (1.6 km) east of Downtown Los Angeles . With its southern portion handling over 550,000 vehicles per day (2008 AADT), it is the busiest freeway interchange in the world. The northern portion, called the San Bernardino Split , is often considered a separate interchange. Four numbered routes converge at the interchange: Interstate 5 (I-5), I-10 , U.S. Route 101 (US 101), and State Route 60 (SR 60), but
2756-651: Is known as the Santa Monica and San Bernardino freeways , linked by a short concurrency on I-5 ( Golden State Freeway ) at the East Los Angeles Interchange . I-10 also has parts designated as the Rosa Parks and Sonny Bono Memorial freeways . Some parts were also formerly designated as the Christopher Columbus Transcontinental Highway. However, the California State Legislature removed this designation following
2862-531: Is north of the later alignment of I-10. The piece of this between San Bernardino and Indio was defined in 1915 as Legislative Route 26 ( LR 26 ). (It continued south from Indio via El Centro to Heber . A 1931 extension took it south to Calexico on present SR 111 .) The route from Indio via Mecca to the Arizona state line near Blythe was defined in 1919 as pre-1964 LR 64. (Later extensions took LR 64 west along present SR 74 ;
2968-539: Is to have the highway route extend from Tamaulipas , Mexico to Ontario , Canada. The planned I-11 will then bridge the Interstate gap between Phoenix, Arizona and Las Vegas, Nevada , and thus form part of the CANAMEX Corridor (along with I-19 , and portions of I-10 and I-15 ) between Sonora , Mexico and Alberta , Canada. Political opposition from residents canceled many freeway projects around
3074-450: Is west of Pomona, but an alignment close to present I-10 opened around 1934). Thus, in 1931, what is now I-10 east of Los Angeles had been defined as LR 26 from Los Angeles to Indio and LR 64 from Indio to Arizona. It was signed as US 99 from San Bernardino to Indio, and US 60 came along around 1932 from Los Angeles to Pomona and from Beaumont to Arizona. US 70 was extended west from Arizona c. 1936 along
3180-575: The Colorado Desert . I-10 cuts through Cathedral City and passes just outside the northern city limits of Rancho Mirage , Palm Desert , and La Quinta before entering Indio . I-10 then has an interchange in Coachella with the northern end of the SR 86 expressway, which also leads to SR 111. Several miles east and roughly halfway between Indio and Blythe , in the community of Desert Center , I-10 intersects with SR 177 ,
3286-474: The Dallas–Fort Worth metroplex in Texas, and an I-35W and I-35E that run through Minneapolis and Saint Paul , Minnesota, still exist. Additionally, due to Congressional requirements, three sections of I-69 in southern Texas will be divided into I-69W , I-69E , and I-69C (for Central). AASHTO policy allows dual numbering to provide continuity between major control points. This is referred to as
Interstate 10 in California - Misplaced Pages Continue
3392-469: The East Los Angeles Interchange . I-10 begins its eastward journey in the city of Santa Monica after SR 1 turns east through the McClure Tunnel. Note that the McClure Tunnel is part of SR 1 in its entirety, and the western terminus of I-10 is to the east of the tunnel at 4th Street. SR 1 then exits onto Lincoln Boulevard and heads south while I-10 continues east. Soon after it enters
3498-552: The Federal Aid Highway Act of 1956 into law. Under the act, the federal government would pay for 90 percent of the cost of construction of Interstate Highways. Each Interstate Highway was required to be a freeway with at least four lanes and no at-grade crossings. The publication in 1955 of the General Location of National System of Interstate Highways , informally known as the Yellow Book , mapped out what became
3604-555: The Grand Forks area have higher speed limits of 75 mph (120 km/h). As one of the components of the National Highway System , Interstate Highways improve the mobility of military troops to and from airports, seaports, rail terminals, and other military bases. Interstate Highways also connect to other roads that are a part of the Strategic Highway Network , a system of roads identified as critical to
3710-880: The Interstate Highway System , or the Eisenhower Interstate System , is a network of controlled-access highways that forms part of the National Highway System in the United States . The system extends throughout the contiguous United States and has routes in Hawaii , Alaska , and Puerto Rico . In the 20th century, the United States Congress began funding roadways through the Federal Aid Road Act of 1916 , and started an effort to construct
3816-529: The Lincoln Highway , the first road across America. He recalled that, "The old convoy had started me thinking about good two-lane highways... the wisdom of broader ribbons across our land." Eisenhower also gained an appreciation of the Reichsautobahn system, the first "national" implementation of modern Germany's Autobahn network, as a necessary component of a national defense system while he
3922-423: The Los Angeles district of Boyle Heights , east of Downtown Los Angeles , the interchange comprises six freeway segments; that is, there are six freeway paths of travel into the complex. The actual number of numbered highways intersecting at this interchange is four: The interchange is so complex because the intersecting freeways shift alignments and directions: There is not complete freedom of movement within
4028-843: The Los Angeles County Metropolitan Transportation Authority (LA Metro), have different toll polices than the ones in San Bernardino County, operated by the San Bernardino County Transportation Authority (SBCTA) and using Transportation Corridor Agencies (TCA) as its processing partner. In both segments, tolls are collected using a congestion pricing system based on the real-time levels of traffic. All tolls are collected using an open road tolling system, and therefore there are no toll booths to receive cash. Each vehicle using
4134-506: The US Department of Defense . The system has also been used to facilitate evacuations in the face of hurricanes and other natural disasters. An option for maximizing traffic throughput on a highway is to reverse the flow of traffic on one side of a divider so that all lanes become outbound lanes. This procedure, known as contraflow lane reversal , has been employed several times for hurricane evacuations. After public outcry regarding
4240-470: The US Highways , which increase from east to west and north to south). This numbering system usually holds true even if the local direction of the route does not match the compass directions. Numbers divisible by five are intended to be major arteries among the primary routes, carrying traffic long distances. Primary north–south Interstates increase in number from I-5 between Canada and Mexico along
4346-553: The West Coast to I‑95 between Canada and Miami, Florida along the East Coast . Major west–east arterial Interstates increase in number from I-10 between Santa Monica, California , and Jacksonville, Florida , to I-90 between Seattle, Washington , and Boston, Massachusetts , with two exceptions. There are no I-50 and I-60, as routes with those numbers would likely pass through states that currently have US Highways with
Interstate 10 in California - Misplaced Pages Continue
4452-530: The Arizona state line at the Colorado River via the vicinity of Monterey Park , Pomona , Colton , Indio , and Chiriaco Summit and via Blythe . Because I-10 west of I-5 cannot access US 101, and I-10 east of I-5 cannot access US 101 southbound, signage instead directs motorists to the continuation of I-10 via I-5 between the East Los Angeles Interchange and the Santa Monica Freeway. The Federal Highway Administration (FHWA)'s Interstate Highway route logs, along with most maps, also indicate that I-10
4558-576: The Congress Hotel in Chicago. In the plan, Mehren proposed a 50,000-mile (80,000 km) system, consisting of five east–west routes and 10 north–south routes. The system would include two percent of all roads and would pass through every state at a cost of $ 25,000 per mile ($ 16,000/km), providing commercial as well as military transport benefits. In 1919, the US Army sent an expedition across
4664-606: The HOT lanes is required to carry a FasTrak Flex transponder, with its switch set to indicate the number of the vehicle's occupants (one, two, three, or more), regardless of whether they qualify for free. Solo drivers may also use the FasTrak standard tag without the switch. For both segments, carpools with three or more occupants are not charged. For two-person carpools using the Los Angeles County segment, they are charged
4770-645: The I-710 interchange, these lanes merge back to the median of I-10. Eastbound busses exit the HOT lanes at El Monte Station west of I-605. The segment of HOT lanes in San Bernardino County opened in 2024, and runs between the Los Angeles county line and Etiwanda Avenue at the Ontario – Fontana city limit. The HOT lanes in Los Angeles County, part of the Metro ExpressLanes project administered by
4876-515: The Interstate Highway System. Assisting in the planning was Charles Erwin Wilson , who was still head of General Motors when President Eisenhower selected him as Secretary of Defense in January 1953. Some sections of highways that became part of the Interstate Highway System actually began construction earlier. Three states have claimed the title of first Interstate Highway. Missouri claims that
4982-493: The Interstate Highway program. The Interstates of Alaska and Puerto Rico are numbered sequentially in order of funding without regard to the rules on odd and even numbers. They also carry the prefixes A and PR , respectively. However, these highways are signed according to their local designations, not their Interstate Highway numbers. Furthermore, these routes were neither planned according to nor constructed to
5088-547: The Kellogg Hill into San Dimas , where I-10 intersects with SR 57 (formerly part of I-210 ) and SR 71 at the Kellogg Interchange . I-10 then heads east through Pomona and Claremont , leaving Los Angeles County to enter San Bernardino County . In San Bernardino County, I-10 travels through Montclair , Upland , and Ontario , providing access to Ontario International Airport . I-10 then has
5194-440: The San Bernardino County line is under environmental review, the section from Etiwanda Avenue to Pepper Avenue in Colton is planned to break ground in 2025, and the segment to Ford Street in Redlands is still in the planning stage. What is now I-10 east of Los Angeles was generally part of the Atlantic and Pacific Highway , one of many transcontinental national auto trails . By 1926, when the US Numbered Highways were assigned,
5300-406: The San Bernardino Freeway. The freeway is 14 lanes wide (two local and five express lanes in each direction) from the Harbor Freeway ( I-110 ) interchange to the Arlington Avenue offramp. Most of these lanes are full at peak travel times (even on Saturdays). The remainder of the freeway varies between eight and 10 lanes in width. The whole freeway opened in 1965 with four to six lanes, with
5406-406: The Santa Monica Freeway going over La Cienega Boulevard collapsed after the Northridge earthquake on January 17, 1994, and were rebuilt using new seismic-resistant bridge designs. The El Monte Busway was converted to HOT lanes in 2013 as part of the Metro ExpressLanes project. On July 19, 2015, a bridge carrying the eastbound lanes of I-10 near Desert Center collapsed from floodwater from
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#17327808180225512-413: The Sierra and Cherry avenue exits. In Riverside County, I-10 goes through Calimesa before entering Beaumont and merging with the eastern end of SR 60 (itself formerly the California segment of US 60 ). In Banning , I-10 has a diamond intersection with SR 243 before passing through San Gorgonio Pass between the San Bernardino and San Jacinto mountains (where the vegetation makes
5618-506: The US to determine the difficulties that military vehicles would have on a cross-country trip. Leaving from the Ellipse near the White House on July 7, the Motor Transport Corps convoy needed 62 days to drive 3,200 miles (5,100 km) on the Lincoln Highway to the Presidio of San Francisco along the Golden Gate . The convoy suffered many setbacks and problems on the route, such as poor-quality bridges, broken crankshafts, and engines clogged with desert sand. Dwight Eisenhower , then
5724-631: The United States, including: In addition to cancellations, removals of freeways are planned: The American Association of State Highway and Transportation Officials (AASHTO) has defined a set of standards that all new Interstates must meet unless a waiver from the Federal Highway Administration (FHWA) is obtained. One almost absolute standard is the controlled access nature of the roads. With few exceptions , traffic lights (and cross traffic in general) are limited to toll booths and ramp meters (metered flow control for lane merging during rush hour ). Being freeways , Interstate Highways usually have
5830-526: The accident investigation). The Santa Monica Freeway is considered the border between Downtown and South Los Angeles. Part of the freeway also skims the Byzantine-Latino Quarter . I-10 heads east from the East Los Angeles Interchange to I-710 in Monterey Park . It then continues through the San Gabriel Valley suburbs of Alhambra , Rosemead , San Gabriel , El Monte , and Baldwin Park before intersecting with I-605 . It then travels through West Covina , briefly enters Covina , and then travels up
5936-413: The act was signed, and paving started September 26, 1956. The state marked its portion of I-70 as the first project in the United States completed under the provisions of the new Federal-Aid Highway Act of 1956. The Pennsylvania Turnpike could also be considered one of the first Interstate Highways, and is nicknamed "Grandfather of the Interstate System". On October 1, 1940, 162 miles (261 km) of
6042-399: The cancellation of the Somerset Freeway . This situation was remedied when the construction of the Pennsylvania Turnpike/Interstate 95 Interchange Project started in 2010 and partially opened on September 22, 2018, which was already enough to fill the gap. However, I-70 remains discontinuous in Pennsylvania , because of the lack of a direct interchange with the Pennsylvania Turnpike at
6148-406: The choice of routing destroyed many well-established neighborhoods, often intentionally as part of a program of " urban renewal ". In the two decades following the 1956 Highway Act, the construction of the freeways displaced one million people, and as a result of the many freeway revolts during this era, several planned Interstates were abandoned or re-routed to avoid urban cores. Construction of
6254-461: The city of Los Angeles, I-10 has a four-level interchange with I-405. I-10 then continues through Sawtelle , Rancho Park , Cheviot Hills , Beverlywood , and Crestview in West Los Angeles ; Lafayette Square and Wellington Square in Mid City ; and Arlington Heights , West Adams , and Jefferson Park into Downtown Los Angeles. On the western edge of downtown at the Dosan Ahn Chang Ho Memorial Interchange , I-10 has an interchange with I-110 to
6360-538: The city. In some locations, low speed limits are the result of lawsuits and resident demands; after holding up the completion of I-35E in St. Paul, Minnesota , for nearly 30 years in the courts, residents along the stretch of the freeway from the southern city limit to downtown successfully lobbied for a 45 mph (70 km/h) speed limit in addition to a prohibition on any vehicle weighing more than 9,000 pounds (4,100 kg) gross vehicle weight . I-93 in Franconia Notch State Park in northern New Hampshire has
6466-401: The collection of tolls, some Interstate routes are toll roads , either because they were grandfathered into the system or because subsequent legislation has allowed for tolling of Interstates in some cases. As of 2022 , about one quarter of all vehicle miles driven in the country used the Interstate Highway System, which has a total length of 48,890 miles (78,680 km). In 2022 and 2023,
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#17327808180226572-431: The construction and improvement of highways. The nation's revenue needs associated with World War I prevented any significant implementation of this policy, which expired in 1921. In December 1918, E. J. Mehren, a civil engineer and the editor of Engineering News-Record , presented his "A Suggested National Highway Policy and Plan" during a gathering of the State Highway Officials and Highway Industries Association at
6678-407: The contiguous United States, primary Interstates—also called main line Interstates or two-digit Interstates—are assigned numbers less than 100. While numerous exceptions do exist, there is a general scheme for numbering Interstates. Primary Interstates are assigned one- or two-digit numbers, while shorter routes (such as spurs, loops, and short connecting roads) are assigned three-digit numbers where
6784-567: The discontinuity, but they have been blocked by local opposition, fearing a loss of business. The Interstate Highway System has been expanded numerous times. The expansions have both created new designations and extended existing designations. For example, I-49 , added to the system in the 1980s as a freeway in Louisiana , was designated as an expansion corridor, and FHWA approved the expanded route north from Lafayette, Louisiana , to Kansas City, Missouri . The freeway exists today as separate completed segments, with segments under construction or in
6890-448: The dissemination of public information. As a result, the 2005 evacuation of New Orleans, Louisiana, prior to Hurricane Katrina ran much more smoothly. According to urban legend , early regulations required that one out of every five miles of the Interstate Highway System must be built straight and flat, so as to be usable by aircraft during times of war. There is no evidence of this rule being included in any Interstate legislation. It
6996-445: The eastern end of the concurrency near Breezewood . Traveling in either direction, I-70 traffic must exit the freeway and use a short stretch of US 30 (which includes a number of roadside services) to rejoin I-70. The interchange was not originally built because of a legacy federal funding rule, since relaxed, which restricted the use of federal funds to improve roads financed with tolls. Solutions have been proposed to eliminate
7102-450: The economy. Not just as a public works measure, but for future growth. Clay's committee proposed a 10-year, $ 100 billion program ($ 1.13 trillion in 2023), which would build 40,000 miles (64,000 km) of divided highways linking all American cities with a population of greater than 50,000. Eisenhower initially preferred a system consisting of toll roads , but Clay convinced Eisenhower that toll roads were not feasible outside of
7208-463: The entire Riverside County segment of I-10 is 70 mph (110 km/h). I-10 westbound is usually signed as toward San Bernardino and/or Los Angeles in the Colorado Desert . Eastbound, in the San Gorgonio Pass, the signage indicates "Indio, Other Desert Cities" and indicates "Blythe" after Indio; the first sign for Phoenix does not occur until Indio. There are two sections of high-occupancy toll (HOT) lanes along I-10, one in Los Angeles County and
7314-439: The existing, largely non-freeway, United States Numbered Highways system. By the late 1930s, planning had expanded to a system of new superhighways. In 1938, President Franklin D. Roosevelt gave Thomas MacDonald , chief at the Bureau of Public Roads, a hand-drawn map of the United States marked with eight superhighway corridors for study. In 1939, Bureau of Public Roads Division of Information chief Herbert S. Fairbank wrote
7420-426: The federal government, Interstate Highways are owned by the state in which they were built. With few exceptions , all Interstates must meet specific standards , such as having controlled access, physical barriers or median strips between lanes of oncoming traffic, breakdown lanes , avoiding at-grade intersections , no traffic lights , and complying with federal traffic sign specifications. Interstate Highways use
7526-411: The first three contracts under the new program were signed in Missouri on August 2, 1956. The first contract signed was for upgrading a section of US Route 66 to what is now designated Interstate 44 . On August 13, 1956, work began on US 40 (now I-70) in St. Charles County. Kansas claims that it was the first to start paving after the act was signed. Preliminary construction had taken place before
7632-614: The first time sought to target these funds to the construction of a national road grid of interconnected "primary highways", setting up cooperation among the various state highway planning boards. The Bureau of Public Roads asked the Army to provide a list of roads that it considered necessary for national defense. In 1922, General John J. Pershing , former head of the American Expeditionary Force in Europe during
7738-608: The freeway segments shift alignments and directions. The interchange was named the Eugene A. Obregon Memorial Interchange to honor U.S. Marine Corps member and Medal of Honor recipient Eugene A. Obregon . At the time of its construction in the early 1960s, the East Los Angeles Interchange was considered a civil engineering marvel. Located along the east bank of the Los Angeles River in
7844-556: The highest speed limits in a given area. Speed limits are determined by individual states. From 1975 to 1986, the maximum speed limit on any highway in the United States was 55 miles per hour (90 km/h), in accordance with federal law. Typically, lower limits are established in Northeastern and coastal states, while higher speed limits are established in inland states west of the Mississippi River . For example,
7950-553: The highly populated coastal regions. In February 1955, Eisenhower forwarded Clay's proposal to Congress. The bill quickly won approval in the Senate, but House Democrats objected to the use of public bonds as the means to finance construction. Eisenhower and the House Democrats agreed to instead finance the system through the Highway Trust Fund , which itself would be funded by a gasoline tax. In June 1956, Eisenhower signed
8056-617: The highway now designated I‑70 and I‑76 opened between Irwin and Carlisle . The Commonwealth of Pennsylvania refers to the turnpike as the Granddaddy of the Pikes, a reference to turnpikes . Milestones in the construction of the Interstate Highway System include: The initial cost estimate for the system was $ 25 billion over 12 years; it ended up costing $ 114 billion (equivalent to $ 425 billion in 2006 or $ 618 billion in 2023 ) and took 35 years. The system
8162-459: The inefficiency of evacuating from southern Louisiana prior to Hurricane Georges ' landfall in September 1998, government officials looked towards contraflow to improve evacuation times. In Savannah, Georgia , and Charleston, South Carolina , in 1999, lanes of I-16 and I-26 were used in a contraflow configuration in anticipation of Hurricane Floyd with mixed results. In 2004, contraflow
8268-439: The interchange. Traffic flowing into it on certain freeways cannot leave it on all of the others. Further complication is caused by the varying designs of each intersecting freeway and their related transition roads. Some have four lanes and are relatively straight and wide, while others have one lane, are narrow, or have curves with tighter radii or cambers. Traffic congestion is thus exacerbated as vehicles moving at high speed on
8374-431: The last two digits match the parent route (thus, I-294 is a loop that connects at both ends to I-94 , while I-787 is a short spur route attached to I-87 ). In the numbering scheme for the primary routes, east–west highways are assigned even numbers and north–south highways are assigned odd numbers. Odd route numbers increase from west to east, and even-numbered routes increase from south to north (to avoid confusion with
8480-454: The mainline. Some auxiliary highways do not follow these guidelines, however. The Interstate Highway System also extends to Alaska , Hawaii , and Puerto Rico , even though they have no direct land connections to any other states or territories. However, their residents still pay federal fuel and tire taxes. The Interstates in Hawaii, all located on the most populous island of Oahu , carry
8586-753: The maximum speed limit is 75 mph (120 km/h) in northern Maine, varies between 50 and 70 mph (80 and 115 km/h) from southern Maine to New Jersey, and is 50 mph (80 km/h) in New York City and the District of Columbia. Currently, rural speed limits elsewhere generally range from 65 to 80 miles per hour (105 to 130 km/h). Several portions of various highways such as I-10 and I-20 in rural western Texas, I-80 in Nevada between Fernley and Winnemucca (except around Lovelock) and portions of I-15 , I-70 , I-80 , and I-84 in Utah have
8692-404: The number of fatalities on the Interstate Highway System amounted to more than 5,000 people annually, with nearly 5,600 fatalities in 2022. The United States government's efforts to construct a national network of highways began on an ad hoc basis with the passage of the Federal Aid Road Act of 1916 , which provided $ 75 million over a five-year period for matching funds to the states for
8798-451: The official Interstate Highway standards . On one- or two-digit Interstates, the mile marker numbering almost always begins at the southern or western state line. If an Interstate originates within a state, the numbering begins from the location where the road begins in the south or west. As with all guidelines for Interstate routes, however, numerous exceptions exist. East Los Angeles Interchange The East Los Angeles Interchange
8904-561: The original Interstate Highway System was proclaimed complete in 1992, despite deviations from the original 1956 plan and several stretches that did not fully conform with federal standards . The construction of the Interstate Highway System cost approximately $ 114 billion (equivalent to $ 618 billion in 2023). The system has continued to expand and grow as additional federal funding has provided for new routes to be added, and many future Interstate Highways are currently either being planned or under construction. Though heavily funded by
9010-661: The other in San Bernardino County. In Los Angeles County, the El Monte Busway is a grade-separated, shared-use HOT and express bus corridor running along the San Bernardino Freeway between Alameda Street near Union Station in Downtown Los Angeles and a point west of I-605 in El Monte . From Alameda Street to I-710 , the El Monte Busway runs parallel to the north side of the freeway. After
9116-667: The passage of a bill on August 31, 2022. I-10 is also known colloquially as "the 10" to Southern California residents (See also California English § Freeways ) . The entirety of Interstate 10 in California is defined in the California Streets and Highways Code as Route 10. The California Streets and Highways Code defines Route 10 (I-10) from: (a) Route 1 [ State Route 1 (SR 1)] in Santa Monica to Route 5 [I-5] near Seventh Street in Los Angeles. (b) Route 101 [ US Route 101 (US 101)] near Mission Road in Los Angeles to
9222-605: The planning phase between them. In 1966, the FHWA designated the entire Interstate Highway System as part of the larger Pan-American Highway System, and at least two proposed Interstate expansions were initiated to help trade with Canada and Mexico spurred by the North American Free Trade Agreement (NAFTA). Long-term plans for I-69 , which currently exists in several separate completed segments (the largest of which are in Indiana and Texas ),
9328-457: The posted toll during the peak hours between 5:00 am and 9:00 am, and between 4:00 pm and 7:00 pm; no toll is charged during off-peak hours. There are longer term plans to have continuous HOT lanes between Alameda Street in Los Angeles and Ford Street in Redlands . This expansion is planned in four phases. As of 2024, the proposed segment in Los Angeles County to bridge the gap between I-605 and
9434-411: The prefix H . There are three one-digit routes in the state ( H-1 , H-2 , and H-3 ) and one auxiliary route ( H-201 ). These Interstates connect several military and naval bases together, as well as the important communities spread across Oahu, and especially within the urban core of Honolulu . Both Alaska and Puerto Rico also have public highways that receive 90 percent of their funding from
9540-499: The remnants of Hurricane Dolores , trapping a vehicle. Shortly after midnight of November 11, 2023, a mile-long (1.6 km) segment of the freeway in Downtown Los Angeles between Alameda Street and Santa Fe Avenue suffered significant damage due to a fire at a pallet yard underneath the freeway. The fire melted the freeway's guardrails and damaged the supporting concrete columns. The Los Angeles Times reported
9646-565: The road across the desert east of Indio was unimproved , while the road from Indio west to San Bernardino (as well as various roads west to Los Angeles ) was paved. In late 1926, US 99 was designated along the section of road from San Bernardino to Indio, where it turned south along present SR 86 on the west side of the Salton Sea . West of San Bernardino, US 99 ran to Los Angeles, concurrent with US 66 (via Pasadena ) before turning north; this route to Los Angeles
9752-537: The route, without regard to the route number. For instance, I-190 in Massachusetts is labeled north–south, while I-195 in New Jersey is labeled east–west. Some looped Interstate routes use inner–outer directions instead of compass directions, when the use of compass directions would create ambiguity. Due to the large number of these routes, auxiliary route numbers may be repeated in different states along
9858-419: The same numbers, which is generally disallowed under highway administration guidelines. Several two-digit numbers are shared between unconnected road segments at opposite ends of the country for various reasons. Some such highways are incomplete Interstates (such as I-69 and I-74 ) and some just happen to share route designations (such as I-76 , I-84 , I‑86 , I-87 , and I-88 ). Some of these were due to
9964-503: The same roadway are signed as traveling in opposite directions; one such wrong-way concurrency is found between Wytheville and Fort Chiswell , Virginia, where I‑81 north and I‑77 south are equivalent (with that section of road traveling almost due east), as are I‑81 south and I‑77 north. Auxiliary Interstate Highways are circumferential, radial, or spur highways that principally serve urban areas . These types of Interstate Highways are given three-digit route numbers, which consist of
10070-413: The south and SR 110 to the north. I-10 then travels along the southern edge of downtown to the East Los Angeles Interchange. At the East Los Angeles Interchange, SR 60 diverges east toward Riverside and Pomona . I-10 then turns north, running concurrently with I-5 for approximately 1.5 miles (2.4 km). Then, I-10 heads east and merges with the traffic from the spur to US 101 onto
10176-514: The top 10 most congested spots in the US. Due to the high traffic volume, car accidents are so common that Caltrans has constructed special accident investigation sites separated from the freeway by fences. These enable the California Highway Patrol to quickly clear accidents from the through traffic lanes, and the fences reduce congestion by preventing rubbernecking (in which vehicles slow down so their occupants can watch
10282-495: The war, complied by submitting a detailed network of 20,000 miles (32,000 km) of interconnected primary highways—the so-called Pershing Map . A boom in road construction followed throughout the decade of the 1920s, with such projects as the New York parkway system constructed as part of a new national highway system. As automobile traffic increased, planners saw a need for such an interconnected national system to supplement
10388-638: The westernmost part of the San Bernardino Freeway , was in fact part of the original San Bernardino Freeway, carrying US 60 / US 70 / US 99 long before the Golden State Freeway opened. It was added to the Interstate Highway System by 1958 as I-110, but in 1968 it was removed from the system, becoming a Route 10 spur. This road is signed only for the roads it feeds into: US 101 northbound and I-10 eastbound. It has only two interchanges between its ends:
10494-431: The whole route to Los Angeles, and, between 1933 and 1942, US 99 moved from US 66 to present I-10 between San Bernardino and Los Angeles, forming a three-way concurrency between Pomona and Los Angeles. Old alignments and names include Valley Boulevard , Ramona Boulevard, and Garvey Avenue . I-10 holds the distinction of being the first freeway in Los Angeles. A four-mile (6.4 km) section of today's freeway
10600-695: The wider transition roads try to merge with slower moving vehicles coming from the narrow transition roads. Construction of the 135-acre (55 ha) freeway interchange began in 1961. The vastness of the structure and the complexity of its many routes called for a $ 17,000 blueprint model of the highway. It has thirty-two bridges and twenty walls with 1,500,000 cubic yards (1,100,000 m ) of earth being excavated. The project laid 23,545 feet (7,177 m) of concrete pipe, used 4,200,000 cubic yards (3,200,000 m ) of concrete and 13,200,000 pounds (6,000,000 kg) of reinforcing and structural steel. Although not commonly called such by residents and other reporters,
10706-501: Was pre-1964 LR 173 , defined in 1933 from Santa Monica to Downtown Los Angeles. It was signed as SR 26 by 1942, running primarily Olympic Boulevard . It was later replaced by the Santa Monica Freeway and added to the Interstate Highway System on September 15, 1955. It too was assigned the I-10 number on August 14, 1957. It was completed c. 1964 and became I-10 in the 1964 renumbering. Portions of
10812-472: Was assigned the I-10 number on August 14, 1957, and the short piece west of I-5 was approved as I-110 on November 10, 1958. By then, most if not all of the San Bernardino Freeway had been completed, and I-10 was signed along the existing freeway along with US 70, US 99, and part of US 60. US 70 and US 99 were removed in the 1964 renumbering , while US 60 was removed in 1972, leaving only I-10. The part west of Downtown Los Angeles
10918-444: Was built between 1933 and 1935 at a cost of $ 877,000 (equivalent to $ 15.3 million in 2023). The "Ramona Boulevard" highway linked downtown Los Angeles to the communities of the southern San Gabriel Valley. The roadway, which opened on April 20, 1935, was dubbed the "Air Line route" and was seen as a major achievement in traffic design. The route east from Los Angeles was added to the Interstate Highway System on August 7, 1957. It
11024-551: Was employed ahead of Hurricane Charley in the Tampa, Florida area and on the Gulf Coast before the landfall of Hurricane Ivan ; however, evacuation times there were no better than previous evacuation operations. Engineers began to apply lessons learned from the analysis of prior contraflow operations, including limiting exits, removing troopers (to keep traffic flowing instead of having drivers stop for directions), and improving
11130-422: Was proclaimed complete in 1992, but two of the original Interstates— I-95 and I-70 —were not continuous: both of these discontinuities were due to local opposition, which blocked efforts to build the necessary connections to fully complete the system. I-95 was made a continuous freeway in 2018, and thus I-70 remains the only original Interstate with a discontinuity. I-95 was discontinuous in New Jersey because of
11236-494: Was serving as Supreme Commander of Allied Forces in Europe during World War II . In 1954, Eisenhower appointed General Lucius D. Clay to head a committee charged with proposing an interstate highway system plan. Summing up motivations for the construction of such a system, Clay stated, It was evident we needed better highways. We needed them for safety, to accommodate more automobiles. We needed them for defense purposes, if that should ever be necessary. And we needed them for
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