Accident High Severity Resolved

CHP : Traffic Hazard on US-101 Southbound exiting at Grand Ave (South San Francisco). Off Ramp blocked. Expect delays.

A high-severity accident was reported on US-101 S near San Mateo on October 21, 2026 at 4:13 PM.

Road

US-101 S

Area

San Mateo

Address

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Started

Oct 21, 9:13 AM

Last Updated

6 days, 1 hour ago

Oct 21, 9:45 AM

Resolved

Oct 21, 4:30 PM

Coordinates

37.6580, -122.4058

Update History

1 observations

CHP : Traffic Hazard on US-101 Southbound exiting at Grand Ave (South San Francisco). Off Ramp blocked. Expect delays. Oct 21, 9:30 AM

Source: 511_sfbay · ID 511.org/1566695 First seen Oct 21, 2026 9:30 AM