|Auxiliary route of I-80|
|Maintained by Caltrans|
|Length||70.52 mi  (113.49 km)|
|History||State highway in 1933; Interstate in 1955|
|I-680 between Mission Boulevard (SR 238) in Fremont to SR 24 in Walnut Creek |
|South end||I-280 / US 101 in San Jose|
|North end||I-80 / SR 12 in Fairfield|
|Counties||Santa Clara, Alameda, Contra Costa, Solano|
Interstate 680 (I-680) is a north–south auxiliary Interstate Highway in Northern California. It curves around 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 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 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 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, 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 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 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, 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 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 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 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 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.  Due to this action being taken shortly before July 4, 2010, and also due to the mural's fame, this was met with controversy. The flag was replaced shortly later.
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 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 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 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 will be resumed in fall 2022. 
HOT lanes then opened in October 2017 in both directions on the portion from slightly south of Alcosta Boulevard near 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 [update] , 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 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 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. 
Tolls are collected only for northbound traffic on 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.  
|Location||San Jose - Fairfield|
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 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, 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 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 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 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 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 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 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 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 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 was made to the routing of I-680: in July 1973, the remainder of SR 21, from Benicia to Fairfield, was added to the Interstate Highway System. This became the new alignment of I-680, and the old route to Vallejo became I-780. The corresponding changes were made by the state legislature in 1976. 
|County||Location||mi    ||km||Exit ||Destinations||Notes|
|Santa Clara||San Jose||0.00||0.00||1A|
I-280 north (Sinclair Freeway) – Downtown San Jose
|Southern terminus; Joe Colla Interchange; Sinclair Freeway continues west as I-280 north|
|0.00||0.00||1B||US 101 (Bayshore Freeway) – Los Angeles, San Francisco||US 101 north exit 384, south exit 385B|
|0.39||0.63||1A||King Road||Signed as exit 1C southbound|
|1.19||1.92||1B||Jackson Avenue||Northbound exit and southbound entrance|
|1.41||2.27||1C||Capitol Expressway (CR G21)||Signed as exit 1D southbound|
|1.74||2.80||2A||SR 130 (Alum Rock Avenue)||No southbound entrance from eastbound Alum Rock Avenue|
|5||Capitol Avenue / Hostetter Road||Signed as exits 5A (Hostetter) and 5B (Capitol) northbound|
|San Jose–Milpitas line||6.17||9.93||6||Montague Expressway (CR G4) / Landess Avenue|
|Milpitas||—||I-680 Sunol Express Lane south ends||South end of southbound Express Lane|
|7.65||12.31||8||SR 237 (Calaveras Boulevard) – Central Milpitas|
| Santa Clara–Alameda |
|Milpitas–Fremont line||9.94||16.00||North end of Sinclair Freeway|
|10.06||16.19||10||Scott Creek Road – Warm Springs District|
SR 262 (Mission Boulevard) to I-880
|Former SR 21 north|
|—||I-680 Sunol Express Lane north begins||South end of northbound Express Lane|
|13.95||22.45||14||Auto Mall Parkway, Durham Road|
|15.31||24.64||15||Washington Boulevard – Irvington District|
|16.33||26.28||16||SR 238 (Mission Boulevard)||Former SR 21 south|
|17.54||28.23||18A||Vargas Road||Signed as exit 18 southbound|
|||18.37||29.56||18B||Sheridan Road||Southbound exit is via exit 20|
|||—||I-680 Sunol Express Lanes||North end of Express Lanes in both directions|
SR 84 west / Calaveras Road – Sunol, Dumbarton Bridge
|South end of SR 84 overlap (northbound only); signed as exit 21 southbound; former SR 21 north|
SR 84 east – Livermore
|North end of SR 84 overlap (northbound only); southbound exit is via a U-turn at exit 21|
|||21.98||35.37||22||Sunol (Koopman Road)||Southbound exit and northbound entrance; former SR 21|
|Pleasanton||24.80||39.91||25||Sunol Boulevard, Castlewood Drive – Pleasanton|
|26.29||42.31||26||Bernal Avenue – Pleasanton|
|Pleasanton–Dublin line||29.60||47.64||30||I-580 / Dublin Boulevard – Dublin, Oakland, Stockton||I-580 exit 44B; Dublin Blvd. not signed northbound; Dublin Blvd. is former US 50. signed as exit 30 southbound|
|Contra Costa||San Ramon||—||I-680 Contra Costa County Express Lanes||South end of Express Lanes in both directions|
|31.43||50.58||31||Alcosta Boulevard – Dublin|
|34.30||55.20||34||Bollinger Canyon Road|
|San Ramon–Danville line||35.60||57.29||36||Crow Canyon Road – San Ramon|
|Danville||38.16||61.41||38||Sycamore Valley Road|
|38.95||62.68||39||Diablo Road – Danville|
|39.57||63.68||40||El Cerro Boulevard||Signed as exit 40A southbound|
|40.14||64.60||40B||El Pintado Road||Northbound exit is via exit 40; southbound exit and northbound entrance only|
|Alamo||41.76||67.21||42||Stone Valley Road||Signed as exits 42A (east) and 42B (west)|
|||—||I-680 Contra Costa County Express Lane north ends||North end of northbound Express Lane|
|Walnut Creek||44.01||70.83||44||Rudgear Road||Southbound exit is via exit 45A|
|44.58||71.74||45A||South Main Street – Walnut Creek||No northbound entrance; former SR 21|
SR 24 west – Lafayette, Oakland
|Signed as exit 46 southbound; SR 24 exits 15A-B|
|46.36||74.61||46B||Ygnacio Valley Road||Northbound exit and southbound entrance|
|47.11||75.82||47||North Main Street – Walnut Creek||Former SR 21|
|47.90||77.09||48||Treat Boulevard, Geary Road||Southbound former Oak Park Boulevard exit|
|Pleasant Hill||48.86||78.63||49A||Contra Costa Boulevard – Pleasant Hill||Northbound exit and southbound entrance; former SR 21|
|49.17||79.13||49B||Monument Boulevard, Gregory Lane||Single-point urban interchange; signed as exit 49 southbound; former SR 24 east|
|Concord–Pleasant Hill line||50.21||80.81||50||SR 242 – Concord, Pittsburg||Northbound exit and southbound entrance; SR 242 south exit 1A|
|50.74||81.66||51||Willow Pass Road, Taylor Boulevard|
|51.56||82.98||52||Concord Avenue, Burnett Avenue – Pacheco, Concord|
|||52.89||85.12||53||SR 4 – Pittsburg, Antioch, Martinez, Hercules||SR 4 exits 12B-C|
|||54.13||87.11||54||Pacheco Boulevard, Arthur Road||Former SR 21|
|Martinez||—||I-680 Contra Costa County Express Lane south begins||North end of southbound Express Lane|
|55.96||90.06||56||Marina Vista Road, Waterfront Road – Martinez|
|Carquinez Strait||57.22||92.09||Benicia–Martinez Bridge (northbound toll only)|
I-780 west – Benicia, Vallejo
|Signed as exit 58 southbound; former I-680 north; I-780 exits 7A-B|
|59.09||95.10||58B||Bayshore Road||Northbound exit and southbound entrance|
|59.55||95.84||60||Industrial Park||Southbound exit and northbound entrance|
|60.91||98.03||61||Lake Herman Road||Former SR 21 south|
|Fairfield||68.11||109.61||68||Gold Hill Road|
|69.99||112.64||70||Green Valley Road – Cordelia||Northbound exit and southbound entrance|
|70.48||113.43||71||I-80 / SR 12 – Fairfield, Sacramento, Napa, San Francisco||Northern terminus; northbound exit and southbound entrance; signed as exits 71A (east) and 71B (west); I-80 exit 40|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
Interstate 880 (I-880) is a north–south auxiliary Interstate Highway in the San Francisco Bay Area of Northern California. It runs from I-280 and State Route 17 (SR 17) in San Jose to I-80 and I-580 in Oakland, running parallel to the eastern shore of San Francisco Bay. For most of its route, I-880 is officially known as the Nimitz Freeway, after World War II fleet admiral Chester W. Nimitz, who retired to the Bay Area. The northernmost five miles (8.0 km) is also commonly referred to as the Cypress Freeway, after the former alignment of the freeway and its subsequent replacement.
Interstate 580 (I-580) is an approximately 76-mile-long (122 km) east–west auxiliary Interstate Highway in Northern California. The heavily traveled spur route of I-80 runs from US Route 101 (US 101) in San Rafael in the San Francisco Bay Area to I-5 at a point outside the southern city limits of Tracy in the Central Valley. I-580 forms a concurrency with I-80 between Albany and Oakland, the latter of which is the location of the MacArthur Maze interchange immediately east of the San Francisco–Oakland Bay Bridge. I-580 provides a connection from the Bay Area to the southern San Joaquin Valley and Southern California via I-5, as I-5 bypasses the Bay Area to the east.
Interstate 780 (I-780) is an east–west auxiliary Interstate Highway in the San Francisco Bay Area of Northern California. It runs from Curtola Parkway and Lemon Street in Vallejo to I-680 just north of the Benicia–Martinez Bridge in Benicia. It closely parallels the Carquinez Strait for its entire route. Originally, this segment was part of I-680 before that Interstate was extended and rerouted to Fairfield. The city-maintained Curtola Parkway continues west from I-80 to State Route 29 (SR 29) in Vallejo.
State Route 91 (SR 91) is a major east–west state highway in the U.S. state of California that serves several regions of the Greater Los Angeles urban area. A freeway throughout its entire length, it officially runs from Vermont Avenue in Gardena, just west of the junction with the Harbor Freeway, east to Riverside at the junction with the Pomona and Moreno Valley freeways.
Interstate 280 (I-280) is a 57.22-mile-long (92.09 km) major north–south auxiliary Interstate Highway in the San Francisco Bay Area of Northern California. It runs from I-680 and US Route 101 (US 101) in San Jose to King and 5th streets in San Francisco, running just to the west of the larger cities of San Francisco Peninsula for most of its route.
State Route 57 (SR 57), also known as the Orange Freeway for most of its length, is a north–south state highway in the Greater Los Angeles Area of the U.S. state of California. It connects the interchange of Interstate 5 (I-5) and SR 22 near downtown Orange, locally known as the Orange Crush, to the Glendora Curve interchange with I-210 and SR 210 in Glendora. The highway provides a route across several spurs of the Peninsular Ranges, linking the Los Angeles Basin with the Pomona Valley and San Gabriel Valley.
State Route 85, known as the West Valley Freeway along its entire length, is a state highway which connects the cities of southern San Jose and Mountain View in the U.S. State of California. The highway intersects with major highways such as I-280, SR 17, and SR 87. The route provides an alternate to U.S. Route 101, bypassing downtown San Jose and instead passing through the foothill cities of Los Gatos, Saratoga, Cupertino, and other cities in the southern San Francisco Peninsula, roughly paralleling the Santa Cruz Mountains up to its interchange with I-280.
Route 238, consisting of State Route 238 (SR 238) and Interstate 238 (I-238), is a mostly north–south state and auxiliary Interstate highway in the San Francisco Bay Area of California. The southern segment is signed as SR 238 and is a divided multilane surface highway that runs parallel to the Hayward hills between I-680 in Fremont and I-580 in Castro Valley. The northern segment is signed as I-238 and is a six-lane freeway that runs more east–west between I-580 and I-880 in San Leandro.
State Route 24 is a heavily traveled east–west state highway in the U.S. state of California that serves the eastern side of the San Francisco Bay Area. A freeway throughout its entire length, it runs from the Interstate 580/Interstate 980 interchange in Oakland, and through the Caldecott Tunnel under the Berkeley Hills, to the Interstate 680 junction in Walnut Creek. It lies in Alameda County, where it is highly urban, and Contra Costa County, where it passes through wooded hillsides and suburbs. SR 24 is a major connection between the San Francisco–Oakland Bay Bridge/MacArthur Maze complex and the inland cities of the East Bay.
State Route 160 is a state highway in the U.S. state of California consisting of two sections. The longer, southern, section is a scenic highway through the alluvial plain of the Sacramento River, linking SR 4 in Antioch with Sacramento via the Antioch Bridge. The northern section, separated from the southern by Sacramento city streets, is the North Sacramento Freeway, running from the 16th Street Bridge over the American River to Interstate 80 Business towards Roseville.
State Route 237 is a state highway in the U.S. state of California that runs from El Camino Real in Mountain View to Interstate 680 in Milpitas. Known as the Southbay Freeway for most of its length, SR 237 runs south of the San Francisco Bay, connecting the East Bay to the Peninsula.
State Route 82 is a state highway in the U.S. state of California that runs from Interstate 880 (I-880) in San Jose to I-280 in San Francisco following the San Francisco Peninsula. It is the spinal arterial road of the peninsula and runs parallel to the nearby Caltrain line along much of the route. For much of its length, the highway is named El Camino Real and formed part of the historic El Camino Real mission trail. It passes through and near the historic downtowns of many Peninsula cities, including Burlingame, San Mateo, Redwood City, Menlo Park, Palo Alto, Mountain View, and Sunnyvale, and through some of the most walkable and transit-oriented neighborhoods in the region.
State Route 9 is a rural and mountainous state highway in the U.S. state of California that travels 35 miles (56 km) from SR 1 in Santa Cruz to SR 17 in Los Gatos, passing through the San Lorenzo Valley and the Saratoga Gap in the Santa Cruz Mountains.
The State Scenic Highway System in the U.S. state of California is a list of highways, mainly state highways, that have been designated by the California Department of Transportation (Caltrans) as scenic highways. They are marked by the state flower, a California poppy, inside either a rectangle for state-maintained highways or a pentagon for county highways.
State Route 17 is a state highway in the U.S. state of California that runs from State Route 1 in Santa Cruz to I-280 and I-880 in San Jose. SR 17, a freeway and expressway, carries substantial commuter and vacation traffic through the Santa Cruz Mountains at Patchen Pass between Santa Cruz and the San Francisco Bay Area.
State Route 262 (SR 262) is a state highway entirely within the Warm Springs District of Fremont, California. It runs along the 1.07-mile (1.72 km) segment of Mission Boulevard between I-880 to the west and I-680 to the east. The route is heavily trafficked, going through a commercial district and containing at least two stop lights.
U.S. Route 101 (US 101) is a major north–south United States Numbered Highway, stretching from Los Angeles, California to Tumwater, Washington. The California portion of US 101 is one of the last remaining and longest U.S. Routes still active in the state, and the longest highway of any kind in California. US 101 was also one of the original national routes established in 1926. Significant portions of US 101 between the Los Angeles area and the San Francisco Bay Area follow El Camino Real, the commemorative route connecting the former Alta California's 21 missions.
Interstate 80 (I-80) is a transcontinental Interstate Highway in the United States, stretching from San Francisco, California, to Teaneck, New Jersey. The segment of I-80 in California runs east from San Francisco across the San Francisco–Oakland Bay Bridge to Oakland, where it turns north and crosses the Carquinez Bridge before turning back northeast through the Sacramento Valley. I-80 then traverses the Sierra Nevada, cresting at Donner Summit, before crossing into the state of Nevada within the Truckee River Canyon. The speed limit is at most 65 mph (105 km/h) along the entire route instead of the state's maximum of 70 mph (110 km/h) as most of the route is in either urban areas or mountainous terrain. I-80 has portions designated as the Eastshore Freeway and Alan S. Hart Freeway.
U.S. Route 50 (US 50) is a transcontinental United States Numbered Highway, stretching from West Sacramento, California, in the west to Ocean City, Maryland, in the east. The California portion of US 50 runs east from Interstate 80 (I-80) in West Sacramento to the Nevada state line in South Lake Tahoe. A portion in Sacramento also has the unsigned designation of Interstate 305. The western half of the highway in California is a four-or-more-lane divided highway, mostly built to freeway standards, and known as the El Dorado Freeway outside of downtown Sacramento. US 50 continues as an undivided highway with one eastbound lane and two westbound lanes until the route reaches the canyon of the South Fork American River at Riverton. The remainder of the highway, which climbs along and out of the canyon, then over the Sierra Nevada at Echo Summit and into the Lake Tahoe Basin, is primarily a two-lane road.
If you use Bay Area Express Lanes, you must use a FasTrak toll tag, otherwise you will receive a violation notice including toll evasion penalties