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Interstate 280 north - San Bruno to San Francisco
Interstate 280 (Junipero Serra Freeway) is in San Bruno, California, heading away from its interchange with Interstate 380 (exit 43) with signage for the next 3 exits to the left, on the southbound side of the highway but facing northbound traffic. (5-4-2026)
Exit 44 up ahead leads to Avalon Drive and Westborough Boulevard. (5-4-2026)
The exit 44 gore sign. (5-4-2026)
Within exit 44, I-280 enters the city limits of South San Francisco, a separate municipality from San Francisco. (5-4-2026)
Exit 46 with Hickey Boulevard is 1¾ miles away. (5-4-2026)
The highway receives its onramp from Westborough to the right. (5-4-2026)
I-280 reassurance sits between exits. (5-4-2026)
The Interstate next receives a slip ramp from the parallel Junipero Serra Boulevard. (5-4-2026)
Next comes an overpass over King Drive. (5-4-2026)
After Hickey, I-280 has an interchange with southbound CA 1 and Eastmoor Avenue. (5-4-2026)
Exit 46 can also be used to access Serramonte Boulevard. (5-4-2026)
Exit 46 lies to the right. (5-4-2026)
The exit 46 gore sign. (5-4-2026)
The Interstate receives a cloverleaf onramp from Hickey before crossing it. (5-4-2026)
Exit 47 with Eastmoor and southbound California State Route 1, which leads to the city of Pacifica, is straight ahead. (5-4-2026)
Following exit 47 by just over a mile is an interchange with John Daly Boulevard. (5-4-2026)
The Interstate passes over Serramonte, which has a southbound-only interchange with I-280 (exit 47A). (5-4-2026)
Northbound through traffic is urged to move left on approach to exit 47. (5-4-2026)
A faded I-280 shield sits just prior to exit 47. (5-4-2026)
I-280 and CA 1 are now marked together on guide signs. Exit 49A, providing access to John Daly and Junipero Serra boulevards, is 1¼ miles away from this sign assembly. (5-4-2026)
The exit 47 gore sign. (5-4-2026)
The highway goes on to pass under the flyover ramps from I-280 north to CA 1 south (top) and from CA 1 north to I-280 north (bottom). Along the latter ramp lies a slip ramp to northbound Junipero Serra. (5-4-2026)
CA 1 completes its merge onto I-280 to the right. (5-4-2026)
In a mile, CA 1 parts with I-280 at exit 49B bound for the Golden Gate Bridge by way of the west side of San Francisco, becoming 19th Avenue. Following the split, I-280 heads toward the San Francisco-Oakland Bay Bridge, which carries parent I-80 over the bay and is accessed via short segments of King, 2nd and Bryant streets. (5-4-2026)
Washington Street crosses the now 12-lane-wide I-280 at this spot. (5-4-2026)
After the CA 1 split, more than two miles pass before the next northbound exit, at Geneva Avenue. In the meantime, though, I-280 has a southbound exit/northbound entrance (exit 50) at San Jose Avenue (CA 82). (5-4-2026)
Exit 49B lies just beyond the School Street overpass. (5-4-2026)
Junipero Serra passes overhead here, going from the west side of the Interstate to the east. (5-4-2026)
Just before exit 49B, beside Bay Area Rapid Transit's Yellow and Red lines, overhead signage points out the lanes to be in for traffic exiting onto northbound CA 1 and for I-280 through traffic. (5-4-2026)
The exit 49B gore sign. (5-4-2026)
John Daly Boulevard passes overhead just before the I-280/CA 1 split. Soon after the split, each route leaves San Mateo County and enters the consolidated city-county of San Francisco. (5-4-2026)