Interstate 580 (I-580) is an approximately 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.
A portion of I-580 is called the MacArthur Freeway, after General Douglas MacArthur. Other portions are named the John T. Knox Freeway (after a former speaker pro tempore of the California State Assembly), the Eastshore Freeway (after its location on San Francisco Bay), the Arthur H. Breed Jr. Freeway (after a former California State assemblyperson and senator—the stretch itself lying between the cities of Castro Valley and Dublin), the William Elton "Brownie" Brown Freeway (after a Tracy resident instrumental in determining the route of I-5 through the San Joaquin Valley), the Sgt. Daniel Sakai Memorial Highway (after the Castro Valley resident and Oakland SWAT officer killed in the 2009 shootings of Oakland police officers), and the John P. Miller Memorial Highway (after the Lodi resident and California Highway Patrol officer killed while chasing down a DUI driver).
Route description
The entirety of I-580 is defined in section 618 of the California Streets and Highways Code as Route 580:
Route 580 is from: (a) Route 5 southwest of Vernalis to Route 80 in Oakland via the vicinity of Dublin and Hayward. (b) Route 80 near Albany to Route 101 near San Rafael via the Richmond-San Rafael Bridge.
The definition omits Route 580's concurrency with Route 80 instead of duplicating that segment in the other route's definition in the code. The overlapped segment with I-80 is also not included in the Federal Highway Administration (FHWA)'s route logs of I-580, but is still signed as such by Caltrans.
The western terminus of I-580 is roughly north of San Francisco in the city of San Rafael (Marin County), at the junction with US 101. The interchange with US 101 is incomplete, only allowing continuous travel from southbound US 101 to eastbound I-580 (via exit 451B) and from westbound I-580 to northbound US 101. Traffic headed the other two directions is encouraged to use Sir Francis Drake Boulevard. Heading eastward through the light industrial portion of eastern San Rafael, I-580 provides access to San Quentin State Prison at the eastern tip of land before joining the Richmond–San Rafael Bridge to cross San Francisco Bay. I-580 enters the city of Richmond in Contra Costa County midspan, then continues through Richmond to join I-80 in Albany in Alameda County at the "Hoffman Split".
After joining I-80, I-580 runs directly south for several miles along the eastern shore of San Francisco Bay in the segment known as the Eastshore Freeway, then enters the MacArthur Maze. The segment between the Hoffman Split and the MacArthur Maze is a wrong-way concurrency, meaning I-580 east is signed as I-80 west, and vice versa. From the MacArthur Maze, I-580 is known as the MacArthur Freeway, which runs through Oakland and San Leandro to Castro Valley. About halfway to Castro Valley from the Maze, is an interchange with the Warren Freeway (State Route 13). Between this interchange and Castro Valley, I-580 runs near or along the trace of the Hayward Fault, a major branch of the San Andreas Fault.
In Castro Valley, I-580 turns eastward toward Dublin Canyon before descending into Dublin and Pleasanton. After passing through Livermore, the freeway enters the Altamont Pass. The road emerges in the Central Valley west of Tracy, where, after I-205 splits near Altamont Raceway Park, it turns southeastward into San Joaquin County and terminates by merging with I-5 south of Tracy just shy of the Stanislaus County line.
I-580 through Altamont Pass is a major crossing of the Diablo Range, linking the Central Valley to the Bay Area, and also a major route to Southern California. I-580 is the only freeway that crosses the Diablo Range, making it the safest route through the mountains. Prior to the construction of this route, traffic was detoured to Pacheco (SR 152) and Polonio (SR 46) passes.
I-580 provides Interstate Highway access between San Francisco and Los Angeles since I-5 runs east of the Bay Area. However, the primary control city listed on freeway signs along eastbound I-580 between I-80 and I-205 is instead Stockton, a vestige of when this segment used to be part of US 50.
I-580 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). The route is eligible for the State Scenic Highway System and is officially designated as a scenic highway by the California Department of Transportation (Caltrans) from the San Leandro city limits to SR 24 and from I-5 to I-205, meaning that these 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.
Truck ban through Oakland Trucks over are prohibited through Oakland between Grand Avenue and the San Leandro border. Specifically, eastbound trucks cannot travel beyond Grand Avenue/Lakeshore Avenue (exit 21B), and those going westbound must get off at MacArthur Boulevard/Foothill Boulevard (exit 30). They are instead instructed to take I-238 in Castro Valley and then I-880 through Oakland as an alternative route. The California Highway Patrol may however temporarily lift the ban for short periods to reduce traffic congestion when major accidents occur on I-880 or I-238.
The truck prohibition has been in effect since before the freeway was built in 1963 as part of US 50. Both the FHWA and Caltrans imposed the restriction, partly because the city of Oakland already had a truck ban through the area prior to the freeway's construction. Since then, the restriction was grandfathered in when the freeway was both renumbered and added to the Interstate Highway System.
As a result, it is the only segment of Interstate Highway in California that is not part of the National Truck Network (several other California state highways have similar truck bans such as SR 2 and SR 85, but not any other Interstates). With trucks normally rerouted onto I-880 instead of I-580 through Oakland, the former generally gets more traffic than the latter. For decades, the trucking industry lobbied to have the ban removed but was unsuccessful due to local opposition. In 2000, the California State Legislature passed Assembly Bill 500, adding the I-580 truck restriction into the California Vehicle Code.
A collaborative study by the Environmental Defense Fund, Google, and the University of Texas at Austin used Google Street View cars equipped with air quality monitors to measure pollution data through Oakland. It found that along I-880, concentrations of black carbon were 80 percent higher, concentrations of nitrogen dioxide were 60 percent higher, and concentrations of nitric oxide were at least double than those along I-580. This has led community leaders to revisit the truck ban, particularly because I-880 runs along minority communities while I-580 runs through middle and upper middle class neighborhoods. Once a proponent of the ban when he served on the Oakland City Council in the 1990s, Alameda County Supervisor Nate Miley held a December 2021 virtual town hall on the issue, and asked both Caltrans and the Bay Area Air Quality Management District to conduct studies on the ban. He did however concede that the California State Legislature would have to eventually repeal the aforementioned rule in the California Vehicle Code for any change to occur.
Caltrans then began to conduct its own study in 2025, including the impact on safety, pollution, and traffic, which is expected to be concluded in 2026. Supporters of lifting the ban continue to argue that it overburdens the minority communities along I-880; supporters of keeping the ban note that there are more schools and community sites along I-580, and argue that lifting the ban would just spread the pollution around the city and the Bay Area.
HOV lanes Peak-hour high-occupancy vehicle (HOV) lanes exist on the westbound approach to the Richmond–San Rafael Bridge, and on both directions of the I-580/I-80 Eastshore Freeway concurrency that extend to the westbound San Francisco–Oakland Bay Bridge approach on I-80.
In April 2026, construction began to convert the westbound far-left lane on I-580 into a HOV lane from east of Piedmont Avenue in Oakland to the existing peak-hour HOV lane at the westbound Bay Bridge approach. Construction is expected to be completed by January 2027.
Tolls I-580 features High-occupancy toll (HOT) lanes along I-580 between Pleasanton and Livermore, which opened in February 2016. The eastbound express lanes stretch between Hacienda Drive and North Greenville Road. The westbound express lanes extend an additional west to San Ramon Road/Foothill Road.
, the HOT lanes' hours of operation is weekdays between 5:00 am and 8:00 pm; they are otherwise free and open to all vehicles at other times. Solo drivers are tolled using a congestion pricing system based on the real-time levels of traffic. Carpools 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 the HOT lanes is required to carry a FasTrak Flex transponder with its switch set to indicate the number of the vehicle's occupants (1, 2, or 3+). 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 also collected for westbound traffic on the Richmond–San Rafael Bridge headed to San Rafael. All-electronic tolling is used on the bridge, and they can be paid by either a FasTrak transponder or license plate tolling.
History I-5W and the San Francisco Bay Area
Interstate 5W (I-5W) was originally conceived as part of a loop Interstate with a directional suffix and was what is now I-580 from I-5 to Oakland. However, I-5W and most of the other Interstates around the country with directional suffixes were eventually renumbered or eliminated, except for I-35E and I-35W in Texas and Minnesota, and more recently in Texas, the designations of I-69W, I-69C, and I-69E, along with proposed suffixed segments for future extensions of I-14 and I-27. The former route of I-5W now corresponds to I-580 from I-5 to Oakland, I-80 from Oakland to Vacaville, and I-505 from Vacaville to I-5 near Dunnigan.
I-5 to Castro Valley For the most part, the I-580 freeway in this segment was constructed over or alongside the right-of-way of US 50, previously part of the old Lincoln Highway, during the course of the late 1960s and early 1970s. The segment which begins at the split with I-205 was constructed during the same period of time over a new right-of-way, running through some low hills on the west side of the San Joaquin Valley near the city of Patterson to a junction with I-5.