Accident High Severity Resolved

CHP : Traffic Collision on US-101 Southbound entering at E Poplar Ave (San Mateo). On Ramp affected. Expect delays.

A high-severity accident was reported on US-101 S near San Mateo on November 1, 2026 at 8:10 PM.

Road

US-101 S

Area

San Mateo

Address

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Started

Nov 1, 12:10 PM

Last Updated

14 hours, 45 minutes ago

Nov 1, 12:30 PM

Resolved

Nov 1, 6:45 PM

Coordinates

37.5795, -122.3235

Update History

2 observations

CHP : Traffic Collision on US-101 Southbound entering at E Poplar Ave (San Mateo). On Ramp affected. Expect delays. Nov 1, 12:30 PM

CHP : Traffic Collision on US-101 Southbound at E Poplar Ave (San Mateo). Off Ramp affected. Expect delays. Nov 1, 12:15 PM

Source: 511_sfbay · ID 511.org/1571541 First seen Nov 1, 2026 12:15 PM