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70-507: SR 24 begins at the four-level stack interchange with Interstate 580 and Interstate 980 in Oakland ; this interchange is located on top of Grove Shafter Park . SR 24 initially heads north before turning east near the Berkeley city limits. Route 24 rises from near sea level in downtown Oakland past its interchange with State Route 13 , which is a freeway south of SR 24 (upgraded August 1999) and

140-506: A concurrency with SR 9 ), and then continued to US 40 (Route 7) at Cordelia. The routing was very close to the present I-680, following such roads as Pleasanton Sunol Road, San Ramon Valley Boulevard, Danville Boulevard, Main Street in Walnut Creek, Contra Costa Boulevard, and Pacheco Boulevard. The portion of SR 21 between Pleasant Hill and Martinez was finally added to

210-405: A stack interchange , is a type of grade-separated junction between two controlled-access highways that allows for free-flowing movement to and from all directions of traffic. These interchanges eliminate the problems of weaving , have the highest vehicle capacity, and vehicles travel shorter distances when compared to different types of interchanges. The first directional interchange built in

280-549: A Texas-style five-level stack exchange (see below). One of the first four-level stack interchanges in the northeastern United States was constructed in the late 1960s over I-84 in Farmington, Connecticut , for the controversial I-291 beltway around the city of Hartford . Most of the I‑291 beltway was later cancelled, and the sprawling stack lay dormant for almost 25 years. In 1992 the extension of Connecticut Route 9 to I-84 used

350-490: A grid of nearby one-way streets . A common setup is for one mainline to go below grade and another to go above grade. The intersection of the frontage roads is typically at grade or close to it. Two pairs of left-turn connectors are built above these. The Dallas–Fort Worth metroplex has several five-level stacks, most notably the High Five Interchange between US 75 and I-635 ; completed in 2005 and currently

420-544: A large piece of concrete on a hill along the Sunol Grade . It stayed there for nine years before the California Department of Transportation (Caltrans) painted it over, as the mural had been painted on without authorization. Of the above names, only the name Sinclair Freeway for its designated portion usually appears on maps, and the other portions on maps are always unnamed, referred to as simply I-680 . I-680

490-506: A railway line bisecting it at its lowest level. The M4/M25 junction is slightly offset so there is no point where all four levels are directly above each other. M25 (a north–south road at this junction) is offset to the east by approximately 60 metres (200 ft). The junction of the A19 and A66 in Teesside uses a three-level variant, with a 270-degree loop allowing southbound A19 traffic to exit to

560-598: A shift in the south end of I-680 in October 1964. The legislature changed the routes in 1965, swapping Route 17 and Route 680 south of Warm Springs and creating a new SR 262 on the short roadway at Warm Springs where they had overlapped to switch sides. However, until I-680 was completed in the early-to-mid 1970s, it remained signed along the Nimitz Freeway, and the old road between San Jose and Warm Springs continued to be marked as SR 238. One more change

630-520: A single point as in a conventional four-level stack. The first four-level stack interchange in Texas was built in Fort Worth at the intersection of I-35W and I-30 (originally I-20) near downtown. This interchange, finished in 1958, was known as "The Pretzel" or the "Mixmaster" by locals. The original contract cost was $ 1,220,000. Improvements to the old Mixmaster over the past 60 years include an upgrade to

700-406: A solo driver, 50 percent of the posted toll is charged. All tolls are collected using an open road tolling system, and therefore there are no toll booths to receive cash. Each vehicle 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 (one, two, three, or more). Solo drivers may also use

770-764: A state public office in Northern California, from the Caldecott Tunnel to the I-580 interchange segment of the MacArthur Maze , continuing henceforth as I-980 to the terminus with I-880. Highway 24 was designated in 1932 in conjunction with the ongoing construction of the Broadway Low Level Tunnel (renamed the Caldecott Tunnel in 1960) which opened in 1937, connecting with the new Eastshore Highway and

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840-509: A surface street north of SR 24. After this, SR 24 crosses the Contra Costa County county line through the four-bore Caldecott Tunnel and offers some attractive views of the hilly terrain through which it passes. Some protection of the views comes from the highway's designation as a California Scenic Highway . On the other side of the tunnel, SR 24 travels through unincorporated Contra Costa County before entering Orinda . SR 24 crosses

910-569: Is a six-level stack on the Yan'an East Road Interchange ( Chinese : 延安东路立交 ) in Puxi, Shanghai, with no dedicated HOV/bus/truck lanes. It is six-level stack because it is formed by two elevated highways, Nanbei Elevated Road and Yan'an Elevated Road with service roads and a footbridge underneath. The centrally located interchange has a central pillar known as the Nine-Dragon Pillar ( 九龙柱 ). The story

980-616: Is a substantial section of highway passing through a "memorable landscape" with no "visual intrusions", where the potential designation has gained popular favor with the community. SR 24 is designated as both the Grove Shafter Freeway , after streets the route travels along (Grove Street was later renamed Martin Luther King Jr. Way), and the William Byron Rumford Freeway, honoring the first African American elected to

1050-620: Is also the only true four-level stack in Canada. Highway 407's other proposed four-level stacks at Highway 410 and Highway 404 were reduced to three-level cloverstack interchanges , with loop ramps being built instead of a fourth level of semi-directional ramps. Similarly, the interchange with Highway 427 has four levels but only two semi-directional flyover ramps that cross each other connecting to Highway 427 south of that junction. Two loop ramps link Highway 407 with Highway 427 north of that junction. In Belgium, on

1120-505: Is currently State Route 70 ), where it continued dual-numbered with 89 through Quincy . Highway 24 split from 89 near Graeagle, and continued east through Portola east until its terminus at U.S. Route 395 . Parts of the same route were also sometimes designated as State Route 84. At least one published map from the 1960s incorrectly showed Route 24 extending eastward from Interstate 680 in Walnut Creek to Route 4 in Pittsburg that followed

1190-503: Is not located near a body of water, most of the city's exports travel through the Port of Durban . The N2 connects Cape Town with Durban and serves the South African cities of Port Elizabeth , East London and George and the towns of Grahamstown , Port Shepstone , Richards Bay and the iSimangaliso Wetland Park . Two busy roads intersect at the junction. A four-level stack interchange

1260-478: Is now I-80 . None of the aforementioned roads were given state sign route numbers in 1934, when that system was laid out, but, by 1937, they had been numbered SR 21. This route began at the intersection of Warm Springs Boulevard and Brown Road in Warm Springs, where Route 5 and Route 69 ( SR 17 ) split, followed Route 5 along Mission Boulevard to Mission San Jose (this part later became

1330-684: Is only a scenic route from Mission Boulevard to the Contra Costa county line and from the Alameda county line to SR 24; this means that those portions are substantial sections of highway passing through a "memorable landscape" with no "visual intrusions", where the potential designation has gained popular favor with the community. There are two sections of High-occupancy toll (HOT) lanes along I-680. The 14-mile (23 km) southbound HOT lane along I-680 between SR 84 in Alameda County and through

1400-784: Is part of the California Freeway and Expressway System and is part of 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 (FHWA). I-680 is eligible to be included in the State Scenic Highway System from the Santa Clara–Alameda county line to SR 24 in Walnut Creek but

1470-566: Is that after several construction accidents, a monk suggested the nine-dragon be welcomed with a bas relief sculpture depicting the dragon. An unusual six-level stack is located at the junction between Interstate 35E and I-635 in Dallas, Texas , and does not contain any service or frontage roads. The interchange features two levels of highway with the top three levels consisting of direct connection ramps and HOV connectors. A single ramp leading from I-635 westbound to I-35E southbound weaves underneath

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1540-546: The Benicia–Martinez Bridge . An open road tolling system is also used on the bridge, and they can be paid by either a FasTrak transponder or license plate tolling . The high-occupancy vehicle (HOV) lane leading to the bridge requires a car with three or more people. By the 1920s, a road ran south from Martinez through Walnut Creek , Dublin , Danville , and Sunol to Mission San Jose , where it met Legislative Route 5 ( Mission Boulevard , signed over

1610-715: The Brussels Ring there are two four-level stack interchanges: The Grand-Bigard and Machelen interchange (only partly in use). In Germany, there is one, the Wetzlarer Kreuz . In Greece, there is also one four stack interchange near Metamorfosi , which connects the A1 and A6 (Attiki Odos) motorways. In the Netherlands there is currently one four-level stack interchange: the Prins Clausplein near The Hague . It forms

1680-443: The California Freeway and Expressway System , and is part of 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 . SR 24 is eligible to be included in the State Scenic Highway System ; however, Caltrans has only designated it as a scenic highway between the eastern end of the Caldecott Tunnel and I-680 , meaning that it

1750-522: The Joe Colla Interchange , where it acts as a continuation of I-280 eastward. From here, it begins its journey northward through San Jose , where it meets the Capitol Expressway , signed as County Route G21 (CR G21), about a mile (1.6 km) northeast of I-680's southern terminus. The next exit northbound is SR 130 , which is also known as Alum Rock Avenue, unsigned at

1820-534: The Martinez–Benicia Ferry took automobiles across the Carquinez Strait to Benicia , where Route 7 , one of the original state highways from the 1910 bond issue , led north and northeast past Fairfield toward Sacramento and Oregon . The portion north from Benicia to Fairfield became part of Route 74 in 1935, when Route 7 was realigned to the more direct American Canyon route that

1890-529: The Mokelumne Aqueduct soon after entering the city of Lafayette . SR 24 terminates at the intersection with Interstate 680 just inside the city limits of Walnut Creek . The Yellow Line of the Bay Area Rapid Transit (BART) system runs in the freeway's center median , excepting the vicinity of the Caldecott Tunnel and the approach to the interchange with Interstate 680 . SR 24 is part of

1960-676: The San Ramon Valley , along the Calaveras Fault . Junctions along this portion include I-580 in Dublin and SR 24 in Walnut Creek . Beyond the latter interchange, a three-way directional junction with the SR ;24 freeway west to Oakland , I-680 heads north into Pleasant Hill , where SR 242 splits and I-680 again heads northwesterly. After the junction with SR 4 in Martinez ,

2030-544: The Sunol Grade to SR 237 in Santa Clara County opened on September 20, 2010. The northbound HOT lane along the same stretch opened in October 2020 but initially as high-occupancy vehicle (HOV) lanes; tolling was halted on this segment of I-680 due to the COVID-19 pandemic and resumed in fall 2022. HOT lanes then opened in October 2017 in both directions on the portion from slightly south of Alcosta Boulevard near

2100-549: The Sunol Valley , where it runs concurrently with SR 84 for a short while. Afterward, it enters Pleasanton and intersects with I-580 , currently California's longest auxiliary Interstate providing access to Oakland and the Central Valley. It enters Dublin for a short segment before exiting the county and entering Contra Costa County . Upon entering Contra Costa County, the route meets numerous local roads through

2170-664: The Ygnacio Valley Road-Kirker Pass Road-Railroad Avenue corridor , presumably as a future extension that never materialized. A 1970 State Highway Map shows this corridor as a future Route 24 bypass. [1] A 1956 version of Thomas Brothers maps shows Mount Diablo Boulevard where present day Northgate Road is and labeled as Route 24, winding and climbing the mountain. Mileage is measured from SR 24's original western terminus, now part of Interstate 980 . Stack interchange#Four-level stack A directional interchange , colloquially known as

California State Route 24 - Misplaced Pages Continue

2240-678: The Alameda– Contra Costa line to Rudgear Road in Walnut Creek. On August 20, 2021, the southbound HOT lanes were extended north from Rudgear Road to Marina Vista Boulevard in Martinez. As of August 2022 , the HOT lanes' hours of operation 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. Carpools, motorcycles, and clean air vehicles with two or more people are not charged. For clean-air vehicles with

2310-578: The Benicia–Martinez Bridge, I-680 northbound is tolled , while I-680 southbound is free. In Benicia, I-680 interchanges with I-780 . It then exits the city and, after passing through rural areas, routing parallel to the San Joaquin Delta , it enters Fairfield , where it meets I-80 , which is the route's northern terminus. In the wake of the September 11 attacks , a US flag was painted on

2380-555: 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. As of 2020, there are environmental studies to extend the northbound toll lanes from Livorna Road to the southern beginning in Martinez, as well as closing the nine-mile express lane gap between Sunol and San Ramon. Neither have begun construction, nor are there any near plans to do so. Tolls are collected only for northbound traffic on

2450-635: The Grove-Shafter Freeway in the late 1960s. This new freeway, which ran from the Caldecott Tunnel through downtown Oakland to the MacArthur and Nimitz Freeways, was designated Route 24 and Ashby was re-designated Route 13. Route 24 used to extend much further east. The section of Interstate 680 between the current terminus of SR 24 and State Route 242 was dual-signed I-680 and SR 24 until c.  1987 ; State Route 242 which runs primarily in Concord

2520-572: The I-635 eastbound bridge, making the interchange six levels. The interchange between I-35E and the Sam Rayburn Tollway in Lewisville, Texas , although similar in design to five-level stacks elsewhere in Texas, also qualifies as a six-level stack, since the ramp connecting the eastbound Sam Rayburn Tollway with northbound I-35E goes over the fifth-level ramps connecting I-35E in both directions with

2590-427: The I‑291 right-of-way and some sections of the abandoned interchange. Several ramps still remain unused, including abandoned roadbed for I-291 both north and south of the complex. Four-level stacks are used for the interchanges between: Another well-known stack interchange lies west of Baltimore, Maryland , serving as the junction between I-695 and I-70 . It was originally built for a planned extension of I‑70 into

2660-646: The Nanjing's Yingtian Street Elevated has one each where it intersects the Inner Ring Road twice. Sometimes a fifth level is added for HOV connectors. An example of this exists in Los Angeles, California , at the Judge Harry Pregerson Interchange . The connector from HOV southbound 110 to HOV westbound 105 can be at the same level as the connector from mixed eastbound 105 to mixed northbound 110, but

2730-400: The SR 24 freeway to Oakland . In the next decade, the freeway was completed from Vallejo south to SR 238 at Mission San Jose , and the roadway north from Benicia to Fairfield, which became the only remaining piece of SR 21, was also upgraded to freeway standards. In the 1964 state highway renumbering , the legislative designation was changed to Route 680. SR 17

2800-533: The Sam Rayburn Tollway. The ramp connecting the westbound Sam Rayburn Tollway with southbound I-35E is on the fourth level of the interchange, going under the fifth-level ramps connecting both directions of I-35E with the Sam Rayburn Tollway. Interstate 680 (California) Interstate 680 ( I-680 ) is a north–south auxiliary Interstate Highway in Northern California . It curves around

2870-460: The approaches to the new Bay Bridge by way of Tunnel Road and Ashby Avenue through Berkeley west of the Berkeley Hills , and routed along Mount Diablo Boulevard through Contra Costa County east of the hills. Before either the bridge or the tunnel were completed, Highway 24 was provisionally routed starting from downtown Oakland at the major intersection of San Pablo and Broadway, which was also

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2940-503: The beltway's northwest quadrant. The newly reconstructed interchange of I-610 and I-69, with the new I‑610 northbound feeder road built underground and the new I-610 southbound feeder road overpass, is also a five-level stack interchange. Though not a Texas-style stack in the above sense, an unusual stack is nonetheless found in Houston that features more than four levels of traffic but whose fifth level exists in only one direction. In 2011,

3010-500: The cities of San Ramon , Danville , and Alamo before entering Walnut Creek , where it meets SR 24 . I-680 then enters Pleasant Hill for a short time and Concord , where it meets SR 242 . Upon exiting Concord, it meets SR 4 . It then enters Martinez , where it follows the Benicia–Martinez Bridge over the Carquinez Strait , on which the route crosses the county line and enters Benicia in Solano County . On

3080-649: The city. Due to strong opposition, I‑70 ends at a park and ride three miles (4.8 km) east. As a result, the road east of I‑695 sees little traffic compared to the high volumes to and from the west. Another four-level stack interchange in the Baltimore area is located at the northeastern junction between I-695 and I-95 . The stack was built as part of a massive I-95 reconstruction project that includes high-occupancy toll lanes (HOT lanes), designed to relieve congestion between Baltimore and its northeastern suburbs. The Springfield Interchange , south of Washington, D.C. ,

3150-640: The connector from HOV southbound 110 to HOV eastbound 105 needs to be higher level, since it crosses over the former connector. Another case is where connection to nearby arterials suggests that another level may be useful, thus making the interchange more complicated but easier to use. In the Atlanta area, a side ramp forms the fifth level of the Tom Moreland Interchange , colloquially known as Spaghetti Junction , found in DeKalb County, Georgia . There

3220-521: The eastern cities of the San Francisco Bay Area from San Jose to I-80 at Fairfield , bypassing cities along the eastern shore of San Francisco Bay such as Oakland and Richmond while serving others more inland such as Pleasanton and Concord . Built in the 1920s as SR 21 and designated in 1955, I-680 begins at a junction with I-280 and US Route 101 (US 101/ Bayshore Freeway ) and heads northeast and north-northwest through

3290-549: The eastern end of C-470 and the southern end of E-470 . In Thornton, Colorado , there is another stack serving I-25 and E-470 at its northern end as it continues west as the Northwest Parkway . The initial design of Highway 407 had several four-level stack interchanges planned at junctions with existing 400-series highways , but only one example was built: the interchange at Highway 400 in Vaughan, Ontario , which

3360-461: The freeway begins in the city of Fremont , where it intersects SR 262 , which was unsigned until 2000. Continuing through the city, it meets Mission Boulevard at SR 238 before exiting the city. Prior to 2002, two ghost ramps existed here, remains of an abandoned freeway project replacing Mission Boulevard. Amid Alameda County, it abruptly turns northeastward and enters a hilly area, where it crosses over Mission Pass , and descends into

3430-577: The highway crosses the Carquinez Strait on the Benicia–Martinez Bridge , immediately meeting the east end of I-780 on the Benicia end. The remainder of I-680, from Benicia to I-80 at Fairfield , lies between a hilly area to the west representing the southwestern tip of the Vaca Mountains , and a marshy area (along the Suisun Bay and Cordelia Slough ) to the east. The route begins at US 101 at

3500-557: The interchange the fifth level, as US 90 to I-10 westbound merges onto I-10 before crossing I-610. (None of the frontage roads for these highways cross the interchange itself, and thus do not factor into the complexity of the stack.) More than 40 bridges make up the five-level stack interchange known as the Big ;I between I-40 and I-25 in Albuquerque, New Mexico . China is also home to many Texas-style stack interchanges. For example

3570-466: The intersection. As it continues through Santa Clara County , it meets numerous local roads before interchanging with the Montague Expressway ( CR G4 ). Here, it exits San Jose and enters the city of Milpitas , where it meets SR 237 , often referred to as Calaveras Boulevard. After one more intersection, I-680 exits Santa Clara County and enters Alameda County . In Alameda County,

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3640-430: The junction of the A4 and A12. In the United Kingdom there are three four-level stacks: at the junction of the M4 and M25 near Heathrow Airport in London (the Thorney Interchange ), at the junction of the M23 and M25 to the south of London (the Merstham Interchange), and at the junction of the M4 and M5 near Bristol (the Almondsbury Interchange ). The M4/M25 junction is particularly unusual as it also has

3710-500: The middle section have traffic driving on the opposite side of oncoming traffic to usual (see diagram for clarity). The first stack interchange was the Four Level Interchange (renamed the Bill Keene Memorial Interchange), built in Los Angeles , California, and completed in 1949, at the junction of US Route 101 (US 101) and State Route 110 (SR 110). Since then, the California Department of Transportation (Caltrans) has built eight more four-level stacks throughout

3780-480: The motorist deviates from the intended direction of travel while on the ramp. Direct ramps are shorter and can handle higher traveling speeds than semi-direct. The four-level stack (or simply four-stack ) has one major freeway crossing another freeway with a viaduct, with connector flyover ramps crossing on two further levels. This type of interchange does not usually permit U-turns . The four-level stack creates two "inverse" dual-carriageways —the turn ramps crossing

3850-515: The northeast part of San Jose. After passing State Route 237 (SR 237) in Milpitas and SR 262 in Fremont , I-680 abruptly turns northeast (where a connection to a SR 238 freeway was planned) and enters the hills and valleys of the California Coast Ranges . The highway crosses over Mission Pass , also known as the Sunol Grade, and descends into the Sunol Valley , where it meets SR 84 near Sunol . From Sunol, I-680 again heads north-northwesterly through valleys, including

3920-404: The previously four-level stack interchange between I-610 and I-10 on the city's east side gained a new (though long-planned) level of complexity with the opening of four ramps connecting the new US 90 (Crosby Freeway) to the east, featuring direct movements for the new freeway to and from the southeast quadrant of I-610, to westbound I-10, and from eastbound I-10. It is the latter ramp which gives

3990-502: The split at Warm Springs (the present location of SR 262 ), SR 21 to Benicia, and Route 74 (no sign route number) to I-80 in Vallejo . The first piece of I-680 freeway built, other than the preexisting Nimitz Freeway, was in the late 1950s, along the SR 24 overlap between North Main Street in Walnut Creek and Monument Boulevard in Pleasant Hill . A southerly extension, bypassing downtown Walnut Creek to South Main Street, opened on March 22, 1960, connecting with

4060-404: The state highway system in 1949, as a branch of Route 75. The ferry approach in Benicia became a spur of Route 74 in 1947, and, in 1953, it was transferred to Route 75. The same law, effective immediately as an urgency measure, authorized the Department of Public Works to acquire the ferry system, then operated by the city of Martinez, which was planning to shut it down. Ownership

4130-418: The state of California , notably the Judge Harry Pregerson Interchange , as well as a larger number of three-level and four-level stack– cloverleaf hybrids (where the least-used left-turning ramp is built as a cloverleaf-like 270-degree loop). The stack interchange between I-10 and I-405 is a three-level stack, since the semi-directional ramps are spaced out far enough so they do not need to cross each other at

4200-670: The tallest interchange in the world. Others can be found at the interchanges between State Highway 121 (SH 121) and the Dallas North Tollway , SH 121 and I-35E / US 77 , I-30 and I-35W , I-30 and President George Bush Turnpike and others which are technically five levels but do not fit under a Texas-style stack configuration (i.e. the extra level being located away from the central stack or existing in only one direction). The Houston area has seven five-level stack interchanges along Beltway 8 : at I-10 east and west of downtown, I-69 northeast and southwest of downtown, I-45 north and south of downtown, and US 290 in

4270-418: The terminal point of US 40 and State Highway 17. From this point, Highway 24 proceeded northward along Broadway to College Avenue, then along College to Claremont Avenue, up Claremont to Tunnel Road, then up into the Berkeley Hills on Tunnel Road to the old Intercounty Tunnel (also called the Kennedy Tunnel), through the tunnel into Contra Costa County. Highway 24 remained along Ashby Avenue until completion of

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4340-400: The upgraded interchange opened in October 2018. A four-level stack interchange was chosen to serve the increasing volumes of traffic in the uMhlanga/Mount Edgecombe area. In Texas , many stacks contain five levels. They usually have the same configuration as four-level stacks, but frontage roads add a fifth level. The frontage roads usually intersect with traffic lights and are similar to

4410-437: The westbound A66. The Light Horse Interchange at the junction of the M4 and M7 is a four-level stack interchange in Sydney , New South Wales, Australia. Opened in late 2005, it is the largest in the Southern Hemisphere. The EB Cloete Interchange just outside Durban, South Africa , is another four-level stack interchange. The N3 is the busiest highway in South Africa and a very busy truck route. Because Johannesburg

4480-407: The world was the Four Level Interchange which opened to Los Angeles traffic in 1949. A directional interchange is a grade separated junction between two roads where all turns that require crossing over or under the opposite road's lanes of travel to complete the turn utilize ramps that make a direct or semi-direct connection. The difference between direct and semi-direct connections is how much

4550-489: The years as US 48 , US 101E , SR 9 , and now SR 238 ). It was not yet paved south of Dublin, where it crossed Mission Pass between the Sunol Valley and the San Francisco Bay basin . The majority of this roadway was added to the state highway system in 1933 as portions of several routes: Route 108 from Mission San Jose to Sunol, Route 107 from Sunol to Walnut Creek, and Route 75 from Walnut Creek to Pleasant Hill . At Martinez,

4620-409: Was chosen to serve the high volumes of traffic. The Mount Edgecombe Interchange is another four-level stack interchange just outside Durban, South Africa , and is the intersection between the N2 (to Durban and KwaDukuza ) and the M41 (to Mount Edgecombe and uMhlanga ). The interchange which was previously a simple diamond interchange was upgraded to a four-level/four-stack interchange, with

4690-408: Was officially moved to former Route 5 between San Jose and Warm Springs, which had not had a signed designation since the Nimitz Freeway (then I-680) was constructed, but this was instead marked as part of SR 238 (which replaced SR 9 north of Mission San Jose), and SR 17 remained signed along the Nimitz Freeway. This was very short-lived, as the Bureau of Public Roads approved

4760-406: Was rebuilt into a four-level stack to accommodate I-95 's transition from the Capital Beltway to its own alignment further south into Virginia. This was necessitated by the inadequacy of the original configuration that was caused by the rerouting of I-95 onto the Beltway after its cancellation within Washington and points north. In Lone Tree, Colorado , there is a four-level stack serving I-25 ,

4830-407: Was signed as Route 24 until the same time. Older maps show routes for 24 which continue along State Route 4 from the current intersection of 242 to the Antioch Bridge , continuing along the river road to Sacramento, currently State Route 160 , then continuing north to Woodland , Marysville , Oroville , along the North Fork of the Feather River to a junction with State Route 89 (this segment

4900-419: Was transferred just after midnight on October 6, 1953. The Bureau of Public Roads approved urban routes of the Interstate Highway System on September 15, 1955, including a loop around the San Francisco Bay , soon numbered I-280 and I-680. The east half (I-680) began at the interchange of US 101 north of Downtown San Jose and followed the Nimitz Freeway (SR 17/Route 69, now I-880 ) to

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