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83-412: West Valley Freeway may refer to: West Valley Freeway (California) , designated State Route 85 West Valley Freeway (Washington) , designated State Route 167 [REDACTED] Topics referred to by the same term This disambiguation page lists articles about roads and streets with the same name. If an internal link led you here, you may wish to change

166-735: A four-leaf clover . A cloverleaf is the minimum interchange required for a four-legged system interchange. Although they were commonplace until the 1970s, most highway departments and ministries have sought to rebuild them into more efficient and safer designs. The cloverleaf interchange was invented by Maryland engineer Arthur Hale, who filed a patent for its design on May   24, 1915. The first one in North America opened on December   15, 1929, in Woodbridge, New Jersey, connecting New Jersey Route   25 and Route   4 (now U.S. Route   1/9 and New Jersey Route   35). It

249-407: A teardrop shape, with the points facing towards the center of the interchange. Longer ramps are often required due to line-of-sight requirements at roundabouts. A partial cloverleaf interchange (often shortened to the portmanteau, parclo ) is an interchange with loops ramps in one to three quadrants, and diamond interchange ramps in any number of quadrants. The various configurations are generally

332-434: A 65 MPH speed limit in 1996. The freeway was constructed with a 46-to-50-foot (14–15 m) wide center median. Initially, no barrier of any kind was installed in the median because, at the time, Caltrans regulations stated that any median wider than 45 feet (14 m) did not require a median barrier unless there was a history of head-on collisions . Public outcry convinced Caltrans to install the standard post-and-metal-beam barrier

415-399: A complex appearance and are often colloquially described as Mixing Bowls , Mixmasters (for a Sunbeam Products brand of electric kitchen mixers ), or as Spaghetti Bowls or Spaghetti Junctions (being compared to boiled spaghetti ). However, they consume a significantly smaller area of land compared to a cloverleaf interchange. A combination interchange (sometimes referred to by

498-475: A directional T interchange) is typically used when a three-way interchange is required for two or three highways interchanging in semi-parallel/perpendicular directions, but it can also be used in right-angle case as well. Their connecting ramps can spur from either the right or left side of the highway, depending on the direction of travel and the angle. Directional T interchanges use flyover/underpass ramps for both connecting and mainline segments, and they require

581-412: A dumbbell interchange or a dogbone interchange, is similar to the diamond interchange, but uses a pair of roundabouts in place of intersections to join the highway ramps with the crossroad. This typically increases the efficiency of the interchange when compared to a diamond, but is only ideal in light traffic conditions. In the dogbone variation, the roundabouts do not form a complete circle, instead having

664-453: A half interchange at Winchester and completely did away with the Quito and Prospect interchanges. As a result, backups at entrances to the freeway near these cities are tremendous during morning rush hour , and Los Gatos and Campbell residents who want to take 85 southward must go two or three miles (3 to 5 km) out of their way to find a ramp onto the freeway. The project was the first in

747-486: A large tree nursery , a driving range, and among other things, overflow parking for De Anza College . State Route 9 originally extended from its current terminus to Mission San Jose along present-day SR 85, SR 237, I-680, SR 262, and SR 238. When the San Jose-Oakland US 101E designation was dropped in 1935, Route 5 between Mission San Jose (where the new SR 21 turned northeast) and Hayward did not retain

830-667: A moderate amount of land and moderate costs since only two levels of roadway are typically used. Their name derives from their resemblance to the capital letter T, depending upon the angle from which the interchange is seen and the alignment of the roads that are interchanging. It is sometimes known as the "New England Y", as this design is often seen in the northeastern United States, particularly in Connecticut. This type of interchange features directional ramps (no loops, or weaving right to turn left) and can use multilane ramps in comparatively little space. Some designs have two ramps and

913-454: A parclo AB features a loop ramp approaching the crossroad in one direction, and beyond the crossroad in the opposing direction, as in the example image. A diverging diamond interchange (DDI) or double crossover diamond interchange (DCD) is similar to a traditional diamond interchange, except the opposing lanes on the crossroad cross each other twice, once on each side of the highway. This allows all highway entrances and exits to avoid crossing

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996-446: A prime factor in reducing the level of noise that the freeway would otherwise produce as most large trucks are unable to use the freeway. HOV or carpool lanes run along the entire length of SR 85. They require at least two people in a car on weekdays from 5-9 am and 3-7 pm, or a car with an "Access OK" sticker. Caltrans is converting these existing HOV lanes to high-occupancy toll (HOT) or Express lanes. Construction of

1079-439: A safer modification of the cloverleaf design, due to a partial or complete reduction in weaving, but may require traffic lights on the lesser-travelled crossroad. Depending on the number of ramps used, they take up a moderate to large amount of land, and have varying capacity and efficiency. Parclo configurations are given names based on the location of and number of quadrants with ramps. The letter A denotes that, for traffic on

1162-442: A signed designation. Later SR 9 was extended north along SR 17 (which had replaced SR 13) from Milpitas to Warm Springs, SR 21 to Mission San Jose, and the independent section of former US 101E - all part of Route 5 - to US 50 (also Route 5, which included a branch to Oakland) near Hayward. Except for a short realignment in the mid-1950s onto Route 69 (now I-880 and SR 262) between Milpitas and Warm Springs, this alignment remained until

1245-543: A small angle and meet the non-freeway at almost right angles. These ramps at the non-freeway can be controlled through stop signs , traffic signals , or turn ramps. Diamond interchanges are much more economical in use of materials and land than other interchange designs, as the junction does not normally require more than one bridge to be constructed. However, their capacity is lower than other interchanges and when traffic volumes are high they can easily become congested. A double roundabout diamond interchange, also known as

1328-525: A steadily annoying whisper of sound day and night to a dull roar that muted backyard conversations. Property values, however, did not diminish; it is possible that the improved commute and access to the vast California freeway network improved the desirability of these neighborhoods. The noise level, however, has continued to be an issue with some residents, particularly in Saratoga. Caltrans has floated several options from repaving with asphalt, to grinding down

1411-540: A system of interconnecting roadways to permit traffic on at least one of the routes to pass through the junction without interruption from crossing traffic streams. It differs from a standard intersection , where roads cross at grade . Interchanges are almost always used when at least one road is a controlled-access highway (freeway) or a limited-access highway (expressway), though they are sometimes used at junctions between surface streets. Note: The descriptions of interchanges apply to countries where vehicles drive on

1494-401: A three-level semi-directional T at Highway 407 and a two-level semi-directional T at Highway 401 . Service interchanges are used between a controlled-access route and a crossroad that is not controlled-access. A full cloverleaf may be used as a system or a service interchange. A diamond interchange is an interchange involving four ramps where they enter and leave the freeway at

1577-509: A three-way interchange. However, in a semi-directional T, some of the splits and merges are switched to avoid ramps to and from the passing lane , eliminating the major disadvantage of the directional T. Semi-directional T interchanges are generally safe and efficient, though they do require more land and are costlier than trumpet interchanges. Semi-directional T interchanges are built as two- or three-level junctions, with three-level interchanges typically used in urban or suburban areas where land

1660-442: A toll road meets another toll road or a free highway. They are also useful when most traffic on the terminating highway is going in the same direction. The turn that is used less often would contain the slower loop ramp. Trumpet interchanges are often used instead of directional or semi-directional T or Y interchanges because they require less bridge construction but still eliminate weaving. A full Y-interchange (also known as

1743-459: A total cost of about $ 237 million. When the SR 17/85 interchange was built in the early 1990s, Caltrans built a tunnel that was to carry traffic from north 17 to north 85, similar to the tunnel that carries traffic from south 17 to south 85. But due to insufficient funds, the second tunnel was sealed at both ends by the dirt embankment, with a loop ramp provided instead. Unfortunately, large sections of

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1826-422: A traditional stack interchange. A three-level roundabout interchange features a grade-separated roundabout which handles traffic exchanging between highways. The ramps of the interchanging highways meet at a roundabout , or rotary, on a separated level above, below, or in the middle of the two highways. These interchanges can also be used to make a "linking road" to the destination for a service interchange, or

1909-446: Is a 3-level stack, since the semi-directional ramps are spaced out far enough, so they do not need to cross each other at a single point as in a conventional 4-level stack. Stacks are significantly more expensive than other four-way interchanges are due to the design of the four levels; additionally, they may suffer from objections of local residents because of their height and high visual impact. Large stacks with multiple levels may have

1992-428: Is an alternative four-way directional interchange. The turbine interchange requires fewer levels (usually two or three) while retaining directional ramps throughout. It features right-exit, left-turning ramps that sweep around the center of the interchange in a clockwise spiral . A full turbine interchange features a minimum of 18 overpasses, and requires more land to construct than a four-level stack interchange; however,

2075-477: Is braided when at least one of the roadways reverses sides. It seeks to make left and right turns equally easy. In a pure braided interchange, each roadway has one right exit, one left exit, one right on-ramp, and one left on-ramp, and both roadways are flipped. The first pure braided interchange was built in Baltimore at Interstate 95 at Interstate 695 ; however, the interchange was reconfigured in 2008 to

2158-567: Is in Santa Clara County . In the 2021 Netflix film The Mitchells vs. the Machines , the route is revealed to be heavily patrolled by PAL Max robots. Interchange (road) In the field of road transport , an interchange (American English) or a grade-separated junction (British English) is a road junction that uses grade separations to allow for the movement of traffic between two or more roadways or highways , using

2241-470: Is more expensive. In a three-level semi-directional T, the two semi-directional ramps from the terminating highway cross the surviving highway at or near a single point, which requires both an overpass and underpass. In a two-level semi-directional T, the two semi-directional ramps from the terminating highway cross each other at a different point than the surviving highway, necessitating longer ramps and often one ramp having two overpasses. Highway 412 has

2324-672: Is officially known as the West Valley Freeway along its entire length. A significant portion of the route is also signed as the Norman Y. Mineta Highway , after former San Jose Mayor, U.S. Congressman, Secretary of Commerce, and Secretary of Transportation Norman Mineta . Its northernmost segment between I-280 and US 101, paralleling the Stevens Creek , also is known as the Stevens Creek Freeway . SR 85

2407-522: Is that SR 85 (instead of I-280) serves as the northern terminus of SR 17 and the southern terminus of I-880 . Although not planned, it is possible to truncate SR 17 further to SR 85 due to the segment meeting interstate standards as well as I-880 still terminating at its parent interstate, I-80 , in Oakland. This route is part of the California Freeway and Expressway System and is part of

2490-466: Is weekdays between 5:00 am and 8:00 pm. Solo drivers are tolled using a congestion pricing system based on the real-time levels of traffic. Two-person carpools and clean air vehicles with a solo driver are charged 50 percent of the posted toll. Carpools with three or more people and motorcycles are not charged. All tolls are collected using an open road tolling system, and therefore there are no toll booths to receive cash. Each vehicle using

2573-471: The Ames Research Center . SR 85 has several points of interest. The northern terminus is located near Moffett Field , with its huge Hangar 1. Google 's main campus and Microsoft 's Silicon Valley Campus are located near the northern end of the freeway. Near the interchange with Interstate 280 , SR 85 runs close to the headquarters of Apple Inc. and next to De Anza College as well as

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2656-609: The I-580 truck ban in Oakland and SR 2 truck ban in Angeles National Forest ). Thus, SR 85 became one of the handfuls of California freeways that do not allow such tractor semis. The restriction is legally in effect from SR 85's southern terminus at U.S. Route 101 to Interstate 280 (exit 19B), although current signage permits southbound trucks to travel further to Stevens Creek Boulevard (exit 18). This ban has been

2739-647: The National Highway System , a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration . In 2014, SR 85 had an annual average daily traffic (AADT) of 58,000 at Bernal Road, and 129,500 at SR 87 , the latter of which was the highest AADT for the highway. The cities along the proposed route also pushed to prohibit trucks over 4.5 short tons (4.1 t; 4.0 long tons) from using SR 85 (similar to

2822-586: The Sierra Club as well as the cities of Saratoga , Los Gatos , and Mountain View for a lack in efficient public transit and higher dependence on automobiles (similar to Los Angeles in the 1960s-1970s) and also criticized VTA at attempting to breach the original 1989 contract which reserved the median divider for mass transportation (presumably light rail). As of August 2022 , the HOT lanes' hours of operation

2905-400: The controlled-access highway , the loop ramps are located in advance of (or approaching ) the crossroad, and thus provide an onramp to the highway. The letter B indicated that the loop ramps are beyond the crossroad, and thus provide an offramp from the highway. These letters can be used together when opposite directions of travel on the controlled-access highway are not symmetrical, thus

2988-403: The "inside" through road (on the same side as the freeway that ends) crossing each other at a three-level bridge. The directional T interchange is preferred to a trumpet interchange because a trumpet requires a loop ramp by which speeds can be reduced, but flyover ramps can handle much faster speeds. The disadvantage of the directional T is that traffic from the terminating road enters and leaves on

3071-462: The 1964 renumbering when SR 9 would eventually be truncated to its existing terminus in Los Gatos. From 1963 to 1965, SR 85 was a 10-mile highway that entirely on surface streets from US 101 near SR 237 to I-280 along Mathilda Ave and Saratoga-Sunnyvale Road (a portion of which was later renamed De Anza Blvd) while the current freeway was being planned. The northern segment was rerouted in 1965 once

3154-421: The 1990s had a total cost of about $ 785 million. The remaining ramps at the SR 85/87 interchange (from 85 south to 87 north and 87 south to 85 north) were completed in 2003. Before these ramps were constructed, travelers had to use Santa Teresa Boulevard (which 87 turned into at its southern terminus) to join 85 north; similarly, travelers on 85 south had to exit at Santa Teresa Boulevard in order to access 87. At

3237-460: The HOT lanes is required to carry either a FasTrak Flex or CAV (Clean Air Vehicle) transponder, with its switch set to indicate the number of the vehicle's occupants (1, 2, or 3 or more). Solo drivers may also use the FasTrak standard tag without the switch. Drivers without any FasTrak tag will be assessed a toll violation regardless of whether they qualified for free. Land was set aside for

3320-548: The United States opened on July   7, 2009, in Springfield, Missouri , at the junction of Interstate 44 and Missouri Route 13 . A single-point urban interchange (SPUI) or single-point diamond interchange (SPDI) is a modification of a diamond interchange in which all four ramps to and from a controlled-access highway converge at a single, three-phase traffic light in the middle of an overpass or underpass. While

3403-401: The bridges are generally short in length. Coupled with reduced maintenance costs, a turbine interchange is a less costly alternative to a stack. A windmill interchange is similar to a turbine interchange, but it has much sharper turns, reducing its size and capacity. The interchange is named for its similar overhead appearance to the blades of a windmill . A variation of the windmill, called

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3486-507: The compact design is safer, more efficient, and offers increased capacity—with three light phases as opposed to four in a traditional diamond, and two left turn queues on the arterial road instead of four—the significantly wider overpass or underpass structure makes them more costly than most service interchanges. Since single-point urban interchanges can exist in rural areas, such as the interchange of U.S. Route 23 with M-59 in Michigan ;

3569-574: The construction of the freeway, the route was signed along Mathilda Avenue and De Anza Boulevard from US 101 near SR 237 southwards until its junction with SR 9 in Saratoga, which then served as its southern terminus until it was decommissioned the same day the freeway opened. SR 85 begins at an interchange with US 101 and heads due west through San Jose . Near the Westfield Oakridge Mall in San Jose, SR 85 has an interchange with

3652-537: The creation of a new basic road as a service interchange. Trumpet interchanges may be used where one highway terminates at another highway, and are named as such for to their resemblance to trumpets . They are sometimes called jug handles . These interchanges are very common on toll roads , as they concentrate all entering and exiting traffic into a single stretch of roadway, where toll plazas can be installed once to handle all traffic, especially on ticket-based tollways . A double-trumpet interchange can be found where

3735-400: The current concrete surface of the highway. An experimental length of the freeway from Cox Avenue to De Anza Boulevard was ground down in 2003. This smoothed out much of the top layer of the freeway removing most of the rain grooves that had been cut in the concrete when the highway was first built. The result did lower the ambient sound levels along that stretch of the freeway, and subsequently,

3818-461: The day suddenly became—and remained—usable. For example, eastern Blossom Hill Road had a typical load of 23,000 cars a day before 85 opened; as of 2004, a typical day's load was a mere 11,000 cars. (Conversely, Saratoga Avenue, which previously had been a fairly quiet road, now sees about 18,000 cars a day because it is the only interchange in or near the city of Saratoga.) As with any freeway, ambient noise in surrounding neighborhoods increased, from

3901-448: The diverging windmill, increases capacity by altering the direction of traffic flow of the interchanging highways, making the connecting ramps much more direct. There also is a hybrid interchange somewhat like the diverging windmill in which left turn exits merge on the left, but it differs in that the left turn exits use left directional ramps. A braided or diverging interchange is a two-level, four-way interchange. An interchange

3984-483: The entire concrete surfaced section of the freeway from Almaden Expressway to Stevens Creek Boulevard was microgrooved in a follow-up project in 2005. Besides the funding breakthrough, SR 85 set new standards in two additional areas: metering lights and median safety barriers. SR 85 was the first freeway in California to open with metering lights at every onramp, including interchanges with SR 17 and US 101. When

4067-416: The entire freeway in the 1950s, with maps first showing the proposed freeway in 1957. At the time, Santa Clara County still largely a rural area, consisting of orchards , and so the right-of-way touched very few existing structures. During Governor Jerry Brown 's tenure in the 1970s, the building of highways was de-emphasized in favor of mass transit , and some building was allowed on the right-of-way with

4150-401: The entire length of the freeway and also to change their regulations so that median barriers are now required on all high-volume freeways with medians of less than 75 feet (23 m). Accidents and injuries dropped by roughly one-third in the first year after the barrier was installed. In 1998, California Highway Patrol officer Scott Greenly was struck by a car and killed while issuing a ticket on

4233-469: The expectation that the freeway would never be built. Local government officials, however, fought to preserve the right-of-way and succeeded in doing so. As a result, when congestion on other freeways— I-280 , US 101 , and SR 17 —intersecting this path became overwhelming, it was still possible for this freeway to be built with little demolition required. In the interim, parts of the unused open space were leased for use without permanent structures, including

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4316-525: The express lanes started in fall 2020, with the first phase between the Central Expressway and SR 85's northern terminus at US 101 opening on February 11, 2022. An extension south to SR 87 is scheduled for 2026. The city of Cupertino filed suit against Caltrans in May 2015 for failure to do a full Environmental Impact Report , and the project attracted overwhelmingly negative reception from

4399-473: The first roads to feature grade-separations. Maryland engineer Arthur Hale filed a patent for the design of a cloverleaf interchange on May   24, 1915, though the conceptual roadwork was not realised until a cloverleaf opened on December   15, 1929, in Woodbridge, New Jersey , connecting New Jersey Route 25 and Route 4 (now U.S. Route 1/9 and New Jersey Route 35 ). It

4482-515: The freeway bed; this caused a traffic jam as motorists slowed to read the message. The flowers were removed after the first day. The route has had a speed limit of 65 MPH since 1996. The overall commute for people from south San Jose through Campbell into Mountain View and other business areas of Silicon Valley improved by roughly half an hour over previous longer routes on already crowded freeways or over miles of surface streets. Major surface streets that had once been unnavigable during many hours of

4565-550: The freeway had to be repainted prior to opening, due to graffiti. The segment from Santa Teresa Boulevard to US 101 in South San Jose was further repaved in 2011 (Northbound) and 2018 (Southbound). Like most California urban freeways at the time it was built, SR 85 originally used a mix of nonreflective and reflective raised pavement markers (i.e., Botts dots and Stimsonite reflectors) to mark lanes. After California phased out Botts' dots (leaving Stimsonite reflectors as

4648-477: The freeway opened on October 19, 1994, the lights caused tremendous backups at the onramps during commute hours, raising an outcry from commuters furious at having to wait as much as 20 to 30 minutes in the worst cases before entering the freeway. The county required Caltrans to turn off the metering lights, which they did on November 17, 1994. This almost immediately slowed the commute over the full 24 mile (39 km) stretch by 33 minutes; Caltrans eventually turned

4731-885: The future 85/87 interchange) and Cottle Road in 1991 with only 2 lanes in each direction, along with the light rail line in the median of SR 85. The extensions to Almaden Expressway and Great Oaks Boulevard were completed in 1992. With the completion of the southern leg (from I-280 to 85) of SR 87 in 1993, the 85/87 interchange opened to traffic that year (with only two connector ramps, from 85 north to 87 north and 87 south to 85 south, due to funding limitations). The HOV lanes were painted on this segment in April 1994. The remaining segments, from US 101 (in South San Jose) to Great Oaks and from Almaden Expressway to I-280, opened in August 1994 and October 1994 respectively. The projects completed in

4814-513: The interchanges at Blossom Hill Road and SR 87 was placed in 1986. Construction of the first structures (at the SR 85/87 and SR 85/Stevens Creek interchanges) broke ground on April 20, 1988. During the Loma Prieta Earthquake in 1989, these segments, along with the other segments under construction, were spared major damage despite being approximately 10 miles north of the epicenter. SR 85 opened between Santa Teresa Boulevard (at

4897-418: The leftmost lane being a HOV lane , and two lanes carrying standard traffic. In addition, to prevent what they felt would be excessive additional traffic on their surface streets, they lobbied heavily to prevent having any freeway entrances or exits in their cities. Full interchanges were originally planned at Winchester Boulevard , Quito Road, Saratoga Avenue, and Prospect Road; the final compromise placed only

4980-539: The lights back on in 1995, which sped up the overall commute considerably. In January 2009, several metering lights in the southern portion of SR 85 were reactivated. These included the SR 87-to-SR 85 interchange, the Almaden Expressway on-ramps, and the Blossom Hill Road on-ramps. From 1994 to 1996, the speed limit on the freeway was 55 MPH. It was one of the first urban freeways to receive

5063-409: The link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=West_Valley_Freeway&oldid=933247200 " Category : Road disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages West Valley Freeway (California) The highway

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5146-437: The northern segment of the freeway opened. The southern segment was deleted in 1994 on the same day the remainder of the current freeway opened. The town of Los Gatos and city of Saratoga added to the complexity and cost of the planning and implementation; to avoid excessive noise, they insisted that the freeway be built below grade (at an eventual additional cost of US$ 60 million), that it have only three lanes in each direction:

5229-547: The only kind of raised pavement marker) and transitioned to wider lane stripes, the freeway was repainted to the new standard in late 2019 (similar to I-15 in Cajon Pass). In October 1994, the completed freeway between Almaden Expressway and I-280 opened with the "Party on the Freeway", a single day on which only pedestrians and bicyclists were allowed to travel its length. The evening before opening day several cities along

5312-594: The opposite direction of travel and saves one signal phase of traffic lights each. The first DDIs were constructed in the French communities of Versailles ( A13 at D182), Le Perreux-sur-Marne ( A4 at N486) and Seclin ( A1 at D549), in the 1970s. Despite the fact that such interchanges already existed, the idea for the DDI was "reinvented" around 2000, inspired by the freeway-to-freeway interchange between Interstate 95 and I-695 north of Baltimore . The first DDI in

5395-513: The passing lane, so the semi-directional T interchange (see below) is preferred. The interchange of Highway 416 and Highway 417 in Ontario, constructed in the early 1990s, is one of the few directional T interchanges, as most transportation departments had switched to the semi-directional T design. As with a directional T interchange, a semi-directional T interchange uses flyover (overpass) or underpass ramps in all directions at

5478-543: The portmanteau, cloverstack ) is a hybrid of other interchange designs. It uses loop ramps to serve slower or less-occupied traffic flow , and flyover ramps to serve faster and heavier traffic flows. If local and express ways serving the same directions and each roadway is connected righthand to the interchange, extra ramps are installed. The combination interchange design is commonly used to upgrade cloverleaf interchanges to increase their capacity and eliminate weaving. Some turbine-stack hybrids: The turbine interchange

5561-467: The problem of weaving, and due to the semi-directional flyover ramps and directional ramps, they are generally safe and efficient at handling high traffic volumes in all directions. A standard stack interchange includes roads on four levels, also known as a 4-level stack, including the two perpendicular highways, and one more additional level for each pair of left-turn ramps. These ramps can be stacked (cross) in various configurations above, below, or between

5644-595: The quality of life. The total US$ 785 million cost of the freeway was mostly funded by the special tax on county residents, along with matching state and federal funds. The project proved successful enough that, since then, many other locales have used local taxes to build state projects. It was also so effective as a solution to traffic problems that, several years after it was built, a poll by the Silicon Valley Manufacturing Group revealed that nearly 80% of voters claimed that they had voted for

5727-587: The right side of the road. For left-side driving, the layout of junctions is mirrored. Both North American (NA) and British (UK) terminology is included. The concept of the controlled-access highway developed in the 1920s and 1930s in Italy, Germany, the United States, and Canada. Initially, these roads featured at-grade intersections along their length. Interchanges were developed to provide access between these new highways and heavily-travelled surface streets. The Bronx River Parkway and Long Island Motor Parkway were

5810-455: The rightmost lane. After demerging from right-turning traffic, they complete their left turn by crossing both highways on a flyover ramp or underpass. The penultimate step is a merge with the right-turn on-ramp traffic from the opposite quadrant of the interchange. Finally, an on-ramp merges both streams of incoming traffic into the left-bound highway. As there is only one off-ramp and one on-ramp (in that respective order), stacks do not suffer from

5893-421: The road is extended. US 70 and US 17 west of New Bern, North Carolina is an example. A stack interchange is a four-way interchange whereby a semi-directional left turn and a directional right turn are both available. Usually, access to both turns is provided simultaneously by a single off-ramp. Assuming right-handed driving, to cross over incoming traffic and go left, vehicles first exit onto an off-ramp from

5976-403: The route, including Saratoga and Campbell, held street fair events on the freeway featuring fine food, wine, and games. Limo service was offered linking the different cities' fairs, giving locals their first glimpse of the new freeway. The next morning 85 was officially opened to traffic. The city of Campbell had planted a large display of pansies spelling out the city's name on the sloped side of

6059-473: The same-named West Valley College , both community colleges in the area. Near interchange with SR 17 , SR 85 runs next to the headquarters of Netflix in Los Gatos. VTA light rail runs in the median of SR 85 between the 85-87 interchange and its southern terminus as well as below it in Mountain View. An infamous misconception for some commuters and businesses in San Jose, Campbell, and Los Gatos

6142-541: The shoulder of Route 85; thereafter the portion between Quito Road and Prospect Road in the City of Saratoga was named the CHP Officer Scott M. Greenly Memorial Freeway . On September 15, 2008, the remainder of the freeway, north of Prospect Road as well as south of Quito Road, was named in honor of former San Jose mayor, congressman, and United States Secretary of Transportation Norman Mineta . The entire route

6225-400: The southern SR 85/101 interchange in South San Jose, carpool-to-carpool ramps and the south 101 to north 85 connector ramp were opened in 2004. The $ 125 million reconstruction of the northern Highway 85/101 interchange in Mountain View, with the original ramps (opened in 1965) replaced and new carpool-to-carpool and other ramps added, was completed in 2006. The projects completed in the 2000s had

6308-725: The southern terminus of the SR 87 freeway, which provides easy access to the San Jose International Airport. SR 85 continues west into Los Gatos , where it intersects the SR 17 freeway. SR 85 briefly enters Campbell and reenters San Jose before crossing into Saratoga . It turns northwest and briefly reenters San Jose before entering Cupertino and passing right next to De Anza College . SR 85 then interchanges with I-280 before briefly entering Sunnyvale and Los Altos and then entering Mountain View , where it first intersects SR 237 before terminating at US 101 near

6391-438: The state for which county residents voted to tax themselves to build a state highway. Because state funds were scarce and congestion on other freeways and on surrounding surface streets was tremendous, a slight majority of voters (56%) voted for the tax in 1984. At the time, there was considerable controversy over whether funds would be better spent on mass transit and whether a freeway through so many residential areas would destroy

6474-486: The tax. The northern section, from Stevens Creek Boulevard in Cupertino to US 101 at Mountain View, was completed and opened on 8 December 1965 as four lanes (I-280 was not complete north of SR 85 up to SR 92 until a few years later so certain ramps remained closed until the 1970s). The northern section's carpool lanes were completed in 1990 (south half) and 1998 (north half). In the southern section, partial fill for

6557-502: The two interchanging highways. This makes them distinct from turbine interchanges, where pairs of left-turn ramps are separated but at the same level. There are some stacks that could be considered 5-level; however, these remain four-way interchanges, since the fifth level actually consists of dedicated ramps for HOV /bus lanes or frontage roads running through the interchange. The stack interchange between I-10 and I-405 in Los Angeles

6640-409: Was built in two phases: the first, comprising the northern half, runs 5.7 miles from Stevens Creek Boulevard near Interstate 280 to its northern terminus at US 101 in Mountain View, was built in the 1960s. The second half, running 18.5 miles from US 101 in southern San Jose to Stevens Creek Boulevard in Cupertino, remained unbuilt until the 1980s and was opened in segments between 1991 and 1994. Prior to

6723-540: Was considered a revolutionary design at the time of its construction. A cloverleaf offers uninterrupted connections between two roads but suffers from weaving issues. Along the mainline, a loop ramp introduces traffic prior to a second loop ramp providing access to the crossroad, between which ingress and egress traffic mixes. For this reason, the cloverleaf interchange has fallen out of favour in place of combination interchanges . Some may be half cloverleaf containing ghost ramps which can be upgraded to full cloverleafs if

6806-436: Was designed by Philadelphia engineering firm Rudolph and Delano, based on a design seen in an Argentinian magazine. A system interchange connects multiple controlled-access highways, involving no at-grade signalised intersections. A cloverleaf interchange is a four-legged junction where left turns across opposing traffic are handled by non-directional loop ramps. It is named for its appearance from above, which resembles

6889-596: Was designed by Philadelphia engineering firm Rudolph and Delano based on a design seen in an Argentinian magazine. The first cloverleaf in Canada opened in 1938 at the junction of Highway 10 and what would become the Queen Elizabeth Way . The first cloverleaf outside of North America opened in Stockholm on October   15, 1935. Nicknamed Slussen , it was referred to as a "traffic carousel" and

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