Interstate 280 South - Santa Mateo County

Interstate 280/Junipero Serra Freeway south
The interchange with Exit 49 (John Daly Boulevard and Junipero Serra Boulevard to Daly City) also includes the merge of California 1 south onto Interstate 280 south. A mileage sign is provided for the distance to South San Francisco and the control city of San Jose. At this point, Interstate 280 enters Daly City, the "Gateway to the Peninsula." Named for John Daly (prominent land owner at the time of the city's early development), the population was 103,621 as of the 2000 Census. The city was incorporated on March 18, 1911. Photo taken 11/26/04.
Through this interchange, Interstate 280 southbound traffic uses a three-lane tunnel to pass under California 1. Photo taken 11/26/04.
This mileage sign provides the distance to the next three exits along Interstate 280 and California 1 south: Exit 48, Eastmoor Avenue and Mission Street; Exit 47B, California 1/Cabrillo Freeway south to Pacifica; and Exit 47A, Serramonte Boulevard. Photo taken 11/26/04.
The next exit along Interstate 280 and California 1 south is Exit 48, Eastmoor Avenue and Mission Street to Daly City. Stay left to remain on Interstate 280/Junipero Serra Freeway south; merge right for Exit 47B, California 1/Cabrillo Freeway south to Pacifica. California 1 travels southwest to Pacifica, then changes into Cabrillo Highway for the coastal route to Half Moon Bay and Santa Cruz. Photo taken 11/26/04.
Southbound Interstate 280 and California 1 reach Exit 48, Eastmoor Avenue and Mission Street in Daly City. Photo taken 11/26/04.

This mileage sign provides the distance to the next three exits along Interstate 280 and California 1 south: Exit 47B, California 1/Cabrillo Freeway south to Pacifica; Exit 47A, Serramonte Boulevard; and Exit 46, Hickey Boulevard to South San Francisco. Photo taken 11/26/04.
The right two lanes split onto California 1/Cabrillo Freeway south (Exit 47B), while the left four lanes carry Interstate 280/Junipero Serra Freeway south to San Jose. Photo taken 11/26/04.
Southbound Interstate 280 and California 1 split at Exit 47B. California 1 (Cabrillo Highway) follows the coastal route from Pacifica to Half Moon Bay, Santa Cruz, and Monterey. Portions of California 1 are freeway, but most of the route is two lanes and is the slower scenic highway. Interstate 280 south to California 17 south offers the same connection to Santa Cruz, and most of that route is freeway or expressway. Photo taken 11/26/04.
Tall flyover ramps dominate the tri-level stack interchange between Interstate 280 and California 1 south at Exit 47B. Photo taken 11/26/04.
The next exit along Interstate 280 south is Exit 47A, Serramonte Boulevard to the Serramonte district of Daly City. This is the last interchange to serve Daly City. Photo taken 11/26/04.
This mileage sign provides the distance to the next three exits along Interstate 280/Junipero Serra Freeway south: Exit 47A, Serramonte Boulevard; Exit 46, Hickey Boulevard to South San Francisco; and Exit 45, Westborough Boulevard. Photo taken 11/26/04.
Southbound Interstate 280/Junipero Serra Freeway reaches Exit 47A, Serramonte Boulevard. The next interchange along southbound is Exit 46, Hickey Boulevard to South San Francisco. Photo taken 11/26/04.
This mileage sign provides the distance to the next three exits along Interstate 280/Junipero Serra Freeway south: Exit 46, Hickey Boulevard to South San Francisco; Exit 45, Westborough Boulevard; and Exit 43B, Sneath Lane and San Bruno Avenue in the city of San Bruno. Photo taken 11/26/04.
Southbound Interstate 280/Junipero Serra Freeway reaches Exit 46, Hickey Boulevard to the city of South San Francisco, "The Industrial City." Home to 61,824 people in 2006 (estimate), South San Francisco has grown as more people have moved out of the city of San Francisco. Photo taken 11/26/04.
The next exit along Interstate 280/Junipero Serra Freeway south is Exit 45, Westborough Boulevard to the city of South San Francisco. Photo taken 11/26/04.
This mileage sign provides the distance to the next three exits along Interstate 280/Junipero Serra Freeway south: Exit 45, Westborough Boulevard; Exit 43B, Sneath Lane and San Bruno Avenue in the city of San Bruno; and Exit 43A, Interstate 380/Kopp Freeway east to U.S. 101 (Bayshore Freeway) and San Francisco International Airport. Photo taken 11/26/04.
Use Westborough Boulevard west to Skyline College and east to Junipero Serra Boulevard south to Avalon Drive. Photo taken 11/26/04.
Southbound Interstate 280/Junipero Serra Freeway reaches Exit 45, Westborough Boulevard. Photo taken 11/26/04.
The next exit along Interstate 280/Junipero Serra Freeway south is Exit 43B, Sneath Lane and San Bruno Avenue. This exit is the first to serve the city of San Bruno (population 40,165 as of the 2000 Census, incorporated in 1914). Photo taken 11/26/04.
After Exit 43B, Sneath Lane and San Bruno Avenue, the second exit is Exit 43A, Interstate 380/Kopp Freeway east to U.S. 101 (Bayshore Freeway) and San Francisco International Airport. Photo taken 11/26/04.
This mileage sign provides the distance to Exit 43B, Sneath Lane and San Bruno Avenue; Exit 43A, Interstate 380/Kopp Freeway east to U.S. 101 (Bayshore Freeway) and San Francisco International Airport; and Exit 42, Crystal Springs Road. Photo taken 11/26/04.
Southbound Interstate 280 reaches Exit 43B, Sneath Lane and San Bruno Avenue; the next off-ramp is Exit 43A, Interstate 380/Kopp Freeway east to U.S. 101 (Bayshore Freeway) and San Francisco International Airport (right lane exit only). Photo taken 11/26/04.
Southbound Interstate 280/Junipero Serra Freeway reaches Exit 43A, Interstate 380/Kopp Freeway east to U.S. 101 (Bayshore Freeway) and San Francisco International Airport. Photo taken 11/26/04.
The next two interchanges -- Exit 42, Crystal Springs Road and Exit 41, Larkspur Drive and Millbrae Avenue -- are not photographed currently.
After Exit 41, the next three exits along southbound are Exit 39, Trousdale Road; Exit 36, Black Mountain Road/Hayne Road; and Exit 34, California 35 South and California 92 West. Photo taken by Pete Sison (05/23/03).
Southbound Interstate 280/California 35 reaches Exit 36, Black Mountain Road/Hayne Road. Photo taken by Pete Sison (05/23/03).
This mileage sign along southbound Interstate 280/California 35 provides the distance to Exit 34, California 35 (Skyline Boulevard) south and California 92 west to Half Moon Bay and Exit 33, California 92 east to San Mateo and Hayward. Photo taken by Pete Sison (05/23/03).
Southbound Interstate 280/California 35 approaches Exit 34, California 35 south and California 92 west to Half Moon Bay, 0.75 mile. Photo taken by Pete Sison (05/23/03).
While most of California 35 remains away from freeway alignments, it has a brief overlap with Interstate 280 that is unlike the rest of the state route. California 35 tends to remain in rural and scenic areas along Skyline Boulevard from San Francisco south to Patchen Pass (California 17). As for California 92, this major east-west state route is the most direct and fastest route to Half Moon Bay and the San Mateo County coast. California 84 by comparison is much slower and more winding than California 92. Photo taken by Pete Sison (05/23/03).
Southbound Interstate 280/California 35 reaches Exit 34, California 35 south and California 92 west to Half Moon Bay. Photo taken by Pete Sison (05/23/03).
California 92 splits from Interstate 280 and heads east into San Mateo, then east across the San Francisco Bay near its widest point. Photo taken by Pete Sison (05/23/03).
Southbound Interstate 280/Junipero Serra Freeway reaches Exit 33, California 92 east to the San Mateo Bridge en route to Hayward, with connections to Interstate 580 en route to the Central Valley. Photo taken by Pete Sison (05/23/03).
The next two interchanges -- Exit 29, Edgewood Road and Exit 27, Farm Hill Boulevard -- are not photographed currently.
After Exit 27, southbound Interstate 280/Junipero Serra Freeway next approaches Exit 25, California 84 (Woodside Road) in Woodside. Photo taken by Pete Sison (05/23/03).
This reassurance shield for southbound Interstate 280 is posted prior to Exit 25, California 84 (Woodside Road). Photo taken by Pete Sison (05/23/03).
Use Exit 25 to California 84 (Woodside Road) east leads to Redwood City (seat of San Mateo County) and Atherton as well as the Dumbarton Bridge to Newark and Fremont in Alameda County. Photo taken by Pete Sison (05/23/03).
The final San Mateo County interchange -- Exit 24, Sand Hill Road -- is not photographed currently.

Continue south to San Jose  Return to the Interstate 280 Guide  Return to the California Gateway

Page Updated February 24, 2008.

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