Accident High Severity Resolved

CHP : Traffic Collision on I-280 Northbound exiting at Avalon Dr (South San Francisco). Off Ramp blocked. Expect delays.

A high-severity accident was reported on I-280 N near San Mateo on May 5, 2026 at 3:57 AM.

Road

I-280 N

Area

San Mateo

Address

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Started

May 4, 8:57 PM

Last Updated

1 month ago

May 4, 9:15 PM

Resolved

May 5, 3:15 AM

Coordinates

37.6390, -122.4408

Update History

2 observations

CHP : Traffic Collision on I-280 Northbound exiting at Avalon Dr (South San Francisco). Off Ramp blocked. Expect delays. May 4, 9:15 PM

CHP : Traffic Collision on I-280 Northbound exiting at Avalon Dr (South San Francisco). Off Ramp blocked. Expect delays. May 4, 9:00 PM

Source: 511_sfbay · ID 511.org/1490127 First seen May 4, 2026 9:00 PM