Interstate 280 (California)

Interstate highway in California

Interstate 280

I-280 highlighted in red

Route information
Maintained by Caltrans
Length| 57.22 mi[1] (92.09 km)
Existed| September 15, 1955, by FHWA[2]
July 1, 1964, by Caltrans[3]–present
Tourist
routes|  Junipero Serra Freeway between the San Mateo–Santa Clara county line and San Bruno[4]
NHS| Entire route
Major junctions
South end|  I-680 / US 101 in San Jose
Major intersections|

* SR 87 in San Jose
* I-880 / SR 17 in San Jose
* SR 85 in Cupertino
* SR 84 in Woodside
* SR 92 near San Mateo
* I-380 in San Bruno
* SR 1 in Daly City
* US 101 in San Francisco

North end| King Street in San Francisco
Location
Country| United States
State| California
Counties| Santa Clara, San Mateo, San Francisco
Highway system

* Interstate Highway System

* Main
* Auxiliary
* Suffixed
* Business
* Future

* State highways in California

* Interstate
* US
* State
* Scenic
* History
* Pre‑1964
* Unconstructed
* Deleted
* Freeways

| ←  SR 275| | →  SR 281

|
|

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.

From I-880 in San Jose to State Route 1 (SR 1) in Daly City, I-280 was built and dedicated as the Junipero Serra Freeway, after the Spanish Franciscan friar who founded the first nine of 21 Spanish missions in California from San Diego to San Francisco. One of the dedication signs (in Daly City) still indicates that the Junipero Serra Freeway is known as the "World's Most Beautiful Freeway"[5] due to its scenic route through the San Francisco Peninsula. From SR 1 to the James Lick Freeway (US 101) in San Francisco it is officially called the John F. Foran Freeway (after a former member of the California State Legislature). From the James Lick Freeway to its northern end at King and 5th streets, I-280 is called the Southern-Embarcadero Freeway.

I-280 is one of two auxiliary Interstate designations to appear on opposite coasts of the United States. I-110 in California and Florida is the only other designation.

I-280 was formerly shown on the app icon for Apple's iOS and macOS built-in Apple Maps. This is because the highway goes through Cupertino, the home of Apple's headquarters.

## Route description

[edit]

The southern end of I-280 is at the Joe Colla Interchange with US 101 in San Jose, where it acts as a continuation of I-680 westward.[6] In between San Jose and San Francisco, I-280 passes through Santa Clara, Cupertino, Los Altos, and Los Altos Hills before it settles along its scenic route just to the west of the cities of the San Francisco Peninsula in San Mateo County and just to the east of the Santa Cruz Mountains. I-280 reemerges in a decidedly urbanized area in the city of San Bruno, passing through South San Francisco and Daly City before it runs across a southeastern swath of the city of San Francisco on the way to its northern terminus.

The segment of the Junipero Serra Freeway between Cupertino (SR 85) and Daly City (SR 1) has been called the "World's Most Beautiful Freeway" since its dedication in the 1960s.[7][8] Drivers along this portion of I-280 are treated to scenic views of the Santa Cruz Mountains to the west and, at a few points, San Francisco Bay to the east and are isolated by hills from the cities to the east. Through much of this segment, the freeway is actually running just inside the eastern rim of the rift valley of the San Andreas Fault. A particularly attractive six-mile (9.7 km) stretch of the freeway from Hillsborough to Belmont provides a view at Crystal Springs Reservoir, formed by water piped over 160 miles (260 km) from Hetch Hetchy Valley in Yosemite National Park, partly filling the rift valley. The waters are impounded by Crystal Springs Dam, which drains into San Francisco Bay via San Mateo Creek; I-280 crosses the deep valley formed by this creek on the Doran Memorial Bridge, completed in 1969.

* I-280
* Aerial view of I-280 in San Jose, looking northeast toward the Joe Colla Interchange (I-680/US 101) in the distance

* I-280 near Stanford University

* Scenic portion of I-280

* Aerial view directed west showing interchange with SR 92; Crystal Springs Reservoir runs north-south parallel to I-280 through the middle of the photograph

For nearly all of its length, I-280 runs roughly parallel and several miles to the west of US 101 (Bayshore Freeway). Both freeways are north–south routes connecting San Jose with San Francisco; however, unlike I-280, the route that US 101 takes between the two cities goes entirely through urbanized areas. The vast majority of the population of the San Francisco Peninsula lives somewhere between I-280 and US 101\.

I-280 does not currently intersect with I-80, its parent Interstate, although it was originally intended to do so. The northern terminus of I-280 is now within about a mile (1.6 km) of I-80's western terminus (at the interchange with US 101), but the two Interstates do not directly connect; instead, I-280 complies with numbering conventions by virtue of its interchanges with the southern ends of I-680 and I-880, both of which connect to I-80 at their northern terminuses. Although San Francisco planned and has had several opportunities to connect I-280 to I-80, it has chosen to use the money for other purposes. Instead, I-280's northernmost extension, which includes a significant double-deck section (with northbound traffic on the lower deck and southbound traffic on the upper), primarily functions now as a spur into the Financial District, San Francisco, as suggested by signage on northbound US 101 at the Alemany Maze.

Major intersections include US 101 and SR 1 in San Francisco, I-380 in San Bruno, SR 92 in San Mateo, SR 85 in Cupertino, and I-880 and I-680 and US 101 in San Jose.

I-280 is part of the California Freeway and Expressway System[9] and is part of the National Highway System,[10] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration (FHWA).[11] I-280 is eligible for the State Scenic Highway System[12] and, from the San Mateo–Santa Clara county line to the San Bruno city limits, is officially designated as a scenic highway by the California Department of Transportation (Caltrans),[13] meaning that it 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.[14] The Junipero Serra Freeway is the name of I-280 from SR 1 in San Francisco to SR 17, as named by Assembly Concurrent Resolution 140, Chapter 208 in 1967, in honor of Spanish missionary Junípero Serra, who founded many of California's missions in the 18th century. I-280 from its southern terminus at US 101 and I-680 north to I-880 in San Jose is part of the Sinclair Freeway (named after Joseph P. Sinclair, District Engineer for District 4 California Division of Highways).[15][16][17] A 26-foot (7.9 m) high faux-sandstone statue of Father Serra kneeling and pointing over the freeway is located at a highway rest area just north of the SR 92 intersection between the Bunker Hill Drive and Black Mountain Road exits on northbound I-280 in Hillsborough and can be clearly seen by drivers in both directions.

The SLAC National Accelerator Laboratory, a research center operated by Stanford University, houses a 2-mile-long linear accelerator that extends underground, running 30 feet below I-280 near the Sand Hill Road exit in Menlo Park.[18][19]

## History

[edit]

1955 map of the planned Interstates in the San Francisco Bay Area. These early plans essentially called for an Interstate loop route that would head south down the San Francisco Peninsula from San Francisco to San Jose, then head north through the eastern cities of the East Bay to Vallejo. This route now basically comprises present-day I-280, I-680, and I-780.

I-280 was added to the Interstate Highway System on September 15, 1955, as a route from San Jose north to San Francisco. This ran along the present alignment of I-280 south of San Francisco, but, in San Francisco, it was instead intended to run north parallel to SR 1, past the planned west end of I-80 which would have been at the junction with the Panhandle Freeway just south of Fulton and Park Presidio, along what would have been the Park Presidio Freeway north to the south approach to the Golden Gate Bridge. At that point, I-280 would have met I-480 (Embarcadero Freeway), which would have headed east on Doyle Drive (US 101), the Golden Gate Freeway, and onto the Embarcadero Freeway to reach the San Francisco–Oakland Bay Bridge. I-480 would have continued south on the never-built section of the Southern-Embarcadero Freeway from Folsom and the Embarcadero to 5th and King streets, then along the present Southern-Embarcadero Freeway to meet the Southern Freeway (now I-280) near the Alemany Maze, which served as the US 101 Bypass until I-280 was built. The I-280 number was approved on November 10, 1958.[2]

In the 1964 renumbering, I-280's legislative designation was officially applied to the planned route. This replaced SR 1 in San Francisco; the new SR 1 alignment turned northeast where I-280 now runs, quickly ending at SR 82 (San Jose Avenue/Alemany Boulevard). SR 1, however, continued to be signed along its former (and current) alignment, which had not been upgraded to freeway standards.

A realignment approved January 1968 primarily took I-280's legislative definition onto its current route. This new routing ran along what had been SR 1, SR 82, SR 87, and I-480 (downgraded to SR 480 then), ending at I-80 at the western Bay Bridge approach.[2] This change was made on the state level in 1968, restoring SR 1 to its current alignment and truncating SR 82, SR 87 and SR 480.[3]

For the scenic portion, the section of I-280 between SR 85 (Cupertino) and SR 84 (Woodside) was completed in the late 1960s alongside SR 85\. The section between SR 92 (San Mateo) and SR 84 was not completed until the 1970s. Until then, traffic was routed on Cañada Road between the two ends.[citation needed]

Aerial photo of the Stanford Linear Accelerator Center, showing the 2-mile building housing the accelerator beamline, which passes under I-280. Cars driving near Page Mill Road on I-280

A direct freeway connection between I-280 and I-80 was never completed. I-280 was planned to run along The Embarcadero underneath the Bay Bridge approach/I-80 to connect to SR 480 and then loop back to the Bay Bridge approach/I-80 near 1st Street.[3] The segment of I-280 between 3rd Street and SR 480 was never built, leaving the I-280 structure terminating in midair at 3rd Street, with ramp stubs at 5th Street that were intended to connect to a parallel bay bridge (also not built). This caused the completed freeway segment from the Bay Bridge approach/I-80 near 1st Street to The Embarcadero to be signed as part of SR 480 instead of I-280.[3][20] After the 1989 Loma Prieta earthquake, plans to connect I-280 to I-80 were abandoned, the earthquake-damaged Embarcadero Freeway was torn down in 1991, and the north end of I-280 was reconfigured to the present-day King Street on/offramps in 1997.[3]

The interchange at the beginning of I-280 at I-680 and US 101 in San Jose was built years before its completion. The three flyovers, with no connecting ramps, stood as a 110-foot-tall (34 m) monument to inefficiency for years in the 1970s, becoming the butt of jokes. The highlight prank occurred in January 1976, when a 1960 Chevrolet Impala was placed on the highest bridge overnight, where it obviously would be impossible to drive. The following day, San Jose City Councilmember Joe Colla was photographed standing next to the car, an image that appeared in many newspapers.[21][22] It has been suggested this stunt nudged the state of California to find the funds to complete the freeway. The ramps opened five years later in 1981. In 2010, a resolution was introduced in the state legislature to name it the Joe Colla Interchange in memory of the late councilmember.[23]

In 2021 University of California, Davis, researchers published a report on wildlife-vehicle collisions based on California Highway Patrol and insurance data over the past five years, according to which five of the 20 one-mile (1.6 km) stretches of highway in the state with the highest costs for this reason are on I-280, the worst being between San Bruno and Cupertino.[24]

## Exit list

[edit]

County| Location| mi[25][26][27][28]| km| Exit[25]| Destinations| Notes

|
|
|
|
|
|

Santa Clara| San Jose| 0.00| 0.00| —|
I-680 north (Sinclair Freeway) – Sacramento| Southern terminus; Joe Colla Interchange; US 101 north exit 384, south exit 385B; Sinclair Freeway continues east as I-680 north

US 101 north (Bayshore Freeway) – San Francisco

US 101 south (Bayshore Freeway) – Los Angeles
0.36| 0.58| 1A| McLaughlin Avenue| Southbound exit and northbound entrance
1.29| 2.08| 1B| 11th Street, 10th Street| Signed as exit 1 northbound
1.55| 2.49| 2A|
7th Street, Virginia Street to SR 82| Signed as exit 2 northbound; Virginia Street not signed northbound
2.20| 3.54| 2B| Almaden Boulevard, Vine Street| Southbound exit and northbound entrance
2.52| 4.06| 3A|  SR 87 (Guadalupe Parkway)| SR 87 exit 5
2.88| 4.63| 3B| Bird Avenue|
3.88| 6.24| 4| Race Street, Southwest Expressway| Northbound exit and southbound entrance
3.99| 6.42| Meridian Avenue| Southbound exit and northbound entrance
4.99| 8.03| 5A| Leigh Avenue, Bascom Avenue|
5.41| 8.71| 5B|

I-880 north (Nimitz Freeway) / SR 17 south – Oakland, Santa Cruz| West end of the Sinclair Freeway, south end of Junipero Serra Freeway; SR 17 north exits 27A-B; I-880 south exit 1B
5.41| 8.71| 5C| Stevens Creek Boulevard, West San Carlos Street| Northbound exit and southbound entrance
5.95| 9.58| 6| Winchester Boulevard| Southbound exit and northbound entrance
7.33| 11.80| 7| Saratoga Avenue – Saratoga|
8.51| 13.70| 9| Lawrence Expressway (CR G2), Stevens Creek Boulevard|
Cupertino| 9.76| 15.71| 10| Wolfe Road|
10.82| 17.41| 11| De Anza Boulevard| Former SR 85
12.12| 19.51| 12A|
SR 85 north – Mountain View| SR 85 north exit 19, south exit 19A
12.12| 19.51| 12B|
SR 85 south – Santa Cruz, Gilroy
Los Altos| 12.83| 20.65| 13| Foothill Expressway (CR G5), Grant Road|
​| 15.48| 24.91| 15| Magdalena Avenue|
Los Altos Hills| 16.43| 26.44| 16| El Monte Road, Moody Road|
​| 19.76| 31.80| 20| Page Mill Road (CR G3), Arastradero Road – Palo Alto| Arastradero Road not signed northbound; Palo Alto not signed southbound
​| 22.00| 35.41| 22| Alpine Road – Portola Valley|
San Mateo| ​| 23.62| 38.01| 24| Sand Hill Road|
Woodside| 25.34| 40.78| 25|  SR 84 (Woodside Road)|
26.65| 42.89| 27| Farm Hill Boulevard|
28.60| 46.03| —| Cañada Road| Entrances only
​| 28.66| 46.12| 29| Edgewood Road|
​| | | Ralph D. Percival Memorial Vista Point (northbound only)
​| | | Former rest area (northbound only; closed)
​| | | Gate Vista Point
​| 32.84| 52.85| 33|  SR 92 – San Mateo, Hayward, Half Moon Bay| Southbound exit to SR 92 west is via exit 34; SR 92 east exits 8A-B, west exit 8
​| 34.33| 55.25| 34|

SR 35 south to SR 92 west / Bunker Hill Drive – Half Moon Bay| South end of SR 35 overlap
San Mateo Creek| 35.27| 56.76| Doran Memorial Bridge
​| 35.43| 57.02| Crystal Springs Rest Area (northbound only)
Hillsborough| 36.24| 58.32| 36| Black Mountain Road, Hayne Road|
​| 39.17| 63.04| 39| Trousdale Drive|
Millbrae| 39.67| 63.84| 40| Millbrae Avenue| Northbound exit and southbound entrance
40.53| 65.23| 41| Larkspur Drive, Millbrae Avenue| Southbound exit and northbound entrance
San Bruno| 41.29| 66.45|
SR 35 north (Skyline Boulevard) – Pacifica| North end of SR 35 overlap; northbound exit and southbound entrance
42.28| 68.04| 42| Crystal Springs Road| Southbound exit and northbound entrance; former SR 117
42.75| 68.80| 43A| San Bruno Avenue, Sneath Lane| Southbound exit and northbound entrance
42.75–
43.02| 68.80–
69.23| 43|

I-380 east to US 101 – San Francisco International Airport| Signed as exit 43A southbound, 43B northbound; I-380 exits 5A-B
43.02| 69.23| 43B| Sneath Lane, San Bruno Avenue| Northbound exit and southbound entrance
South San Francisco| 44.05| 70.89| 44| Avalon Drive, Westborough Boulevard| Northbound exit and southbound entrance; former SR 117
44.63| 71.83| 45| Westborough Boulevard| Northbound exit as well as southbound entrance from westbound Westborough Blvd. are via exit 44
Daly City| 46.20| 74.35| 46| Hickey Boulevard|
46.83| 75.37| 47A| Serramonte Boulevard| Southbound exit and northbound entrance
47.29| 76.11| 47|
SR 1 south / Eastmoor Avenue – Pacifica| Northbound signage; SR 1 north exits 509B and 510
47B|
SR 1 south – Pacifica| Southbound signage; south end of SR 1 overlap; SR 1 north exit 509B
47.78| 76.89| 48| Eastmoor Avenue, Sullivan Avenue| Southbound exit and northbound entrance
48.51| 78.07| 49A| John Daly Boulevard, Junipero Serra Boulevard| Signed as exit 49 southbound
49.17| 79.13| 49B|
SR 1 north (19th Avenue) – Golden Gate Bridge| North end of SR 1 overlap; northbound left exit and southbound entrance; SR 1 south exit 511
City and County of San Francisco| 50.18| 80.76| 50|

SR 82 to SR 1 north / Mission Street, San Jose Avenue| Southbound exit and northbound entrance
51.21| 82.41| 51| Geneva Avenue, Ocean Avenue|
52.13| 83.90| 52| Monterey Boulevard| Southbound exit and northbound entrance
52.14| 83.91| San Jose Avenue, Bosworth Street| Northbound exit and southbound entrance
52.72| 84.84| 53| Alemany Boulevard, Mission Street| Mission Street not signed northbound
53.78| 86.55| 54A|
US 101 south (James Lick Freeway) – San Jose| Southern end of Alemany Maze; signed as exit 54 southbound; US 101 north exit 430A
53.78| 86.55| 54B|
US 101 north (James Lick Freeway) – San Francisco Civic Center, Bay Bridge| Northbound exit and southbound entrance; northern end of Alemany Maze; US 101 south exit 431
55.06| 88.61| 55| Cesar Chavez Street, 25th Street| 25th Street not signed northbound; Cesar Chavez Street was formerly Army Street
56.04| 90.19| 56| Mariposa Street, 18th Street| 18th Street not signed northbound
56.73| 91.30| 57| Sixth Street| Northbound exit and southbound entrance
56.98| 91.70| —| Fifth Street| At-grade intersection; northern terminus
—| King Street| Continuation beyond Fifth Street
| | —| Fourth Street| Former northern terminus; replaced with the current King Street ramps; northbound exit only
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

*       Closed/former
*       Concurrency terminus
*       Incomplete access
*       Route transition

## See also

[edit]

* California Roads portal
* San Francisco Bay Area portal

## References

[edit]

1. ^ "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. December 31, 2021. Retrieved July 3, 2022.
2. ^ a b c "California Highways: Interstate Highway Types and the History of California's Interstates". Cahighways.org. Retrieved January 26, 2013.
3. ^ a b c d e "California Highways: Interstate 280". Cahighways.org. Retrieved February 21, 2020.
4. ^ California Department of Transportation (August 2019). "Officially Designated State Scenic Highways and Historic Parkways" (XLSX). Sacramento: California Department of Transportation. Retrieved March 27, 2019.
5. ^ "In the Eye of the Beholder | A Kauai Blog". Great-hikes.com. March 23, 2005. Retrieved January 26, 2013.
6. ^ United States Geological Survey (2018). Written at Menlo Park, CA. San Jose East, CA (Topographic map). 1:24,000. 7.5 Minute Series. Reston, VA: United States Geological Survey. Retrieved November 11, 2020.
7. ^ "'Most Beautiful Freeway' Is the Role Model : Challenge Handed to Toll Road Designers". Los Angeles Times. May 13, 1988. Retrieved September 5, 2019.
8. ^ "Roadshow: Is I-280 truly the 'World's Most Beautiful Freeway'?". East Bay Times. March 14, 2010. Retrieved September 5, 2019.
9. ^ "Article 2 of Chapter 2 of Division 1". California Streets and Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
10. ^ Federal Highway Administration (March 25, 2015). National Highway System: California (North) (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved August 19, 2017.
11. ^ Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
12. ^ "Article 2.5 of Chapter 2 of Division 1". California Streets & Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
13. ^ California Department of Transportation (August 2019). "Officially Designated State Scenic Highways and Historic Parkways" (XLSX). Sacramento: California Department of Transportation. Retrieved August 19, 2017.
14. ^ California Department of Transportation (2012). Scenic Highway Guidelines (PDF). Sacramento: California Department of Transportation. p. 5. Retrieved June 8, 2017.
15. ^ Joseph Pierce Sinclair
16. ^ "Opening Ceremonies Pamphlet—The Sinclair Freeway-Interstate 280—Calif Div. of Highways-District 4"
17. ^ California Department of Transportation; California State Transportation Agency (January 2021). 2020 Named Freeways, Highways, Structures and Other Appurtenances in California (PDF). Sacramento: California Department of Transportation. pp. 89, 341, 342. Archived from the original (PDF) on October 10, 2022.
18. ^ Hubbard, Linda (August 25, 2012). "SLAC celebrates 50th anniversary: What's gone on underneath Menlo Park?". InMenlo. Retrieved July 6, 2025.
19. ^ Myrow, Rachael (March 14, 2024). "Unraveling the Mysteries of the Universe Inside SLAC". KQED. Retrieved July 6, 2025.
20. ^ "California Highways: Former State Route 480". Cahighways.org. Retrieved February 21, 2020.
21. ^ Herhold, Scott (October 16, 2013). "Herhold: The story behind Joe Colla's famous 1976 highway stunt". Retrieved October 5, 2014.
22. ^ "Person Details for Joseph A Colla, 'United States Social Security Death Index' — FamilySearch.org". FamilySearch. Retrieved April 8, 2014.
23. ^ Richards, Gary (February 16, 2010) [February 15, 2010]. "Roadshow: The Joe Colla Interchange". InsideBayArea.com. Archived from the original on October 12, 2014.
24. ^ Stoughtenborough, Ryce (November 11, 2021). "This Bay Area highway sees more roadkill than any other road in the state". San Francisco Chronicle. Retrieved November 14, 2021.
25. ^ a b "Interstate 280 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. California Department of Transportation. September 7, 2018. Retrieved October 21, 2020.
26. ^ California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on September 5, 2015. Retrieved June 30, 2015.
27. ^ California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
28. ^ California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006

## External links

[edit]

Wikimedia Commons has media related to Interstate 280 (California).

KML file (edit • help)

Template:Attached KML/Interstate 280 (California)

KML is from Wikidata

* Caltrans: I-280 highway conditions
* Caltrans Traffic Conditions Map
* California Highway Patrol Traffic Incidents
* AARoads – Interstate 280
* Planning maps for the pre-1968 planned route of the freeway along Junipero Serra Boulevard in San Francisco
* California Highways: I-280
* Freeways not built in S.F.

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Auxiliary routes of Interstate 80

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