Crash on US-101 Southbound to I-280 Southbound at Alemany Boulevard Undercrossing, San Francisco, California

Wednesday, April 29, 2026 at 4:55 PM

Property damage only2 vehicles

From the CHP CCRS, record last updated October 25, 2026. No changes since first published.

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Location: US-101 Southbound to I-280 Southbound at Alemany Boulevard Undercrossing
City, county: San Francisco, San Francisco County
Collision type: Rear End
Motor vehicle involved with: Other Motor Vehicle
Posted speed limit: 50 mph
Primary collision factor cited: No
Weather: Clear
Light: Daylight
Road surface: No Unusual Conditions
Hit and run: No
People involved: 2
Injured: 0
Killed: 0

Damage area not recorded

White Motorcycle

Driver, female, 31Restraint: Motor Bicycle Driver with Helmet. Airbag: Not Required
Not injured

Damage area not recorded

Gray Passenger Car Station Wagon Jeep

Driver, male, 29Restraint: Occupant Lap Shoulder Harness Used. Airbag: Air Bag Not Deployed
Not injured

Violation cited: VC 22350 UNSAFE SPEED FOR PREVAILING CONDITIONSas recorded on the report
Unit 1 contributing factor: INATTENTIONas recorded on the report

A contributing factor or charge recorded by an officer is not a finding of fault or a conviction. We show the record as the state released it.

2 crashes recorded on US-101 Southbound to I-280 Southbound in San Francisco in the last 12 months, 0 with injuries.

May 29, 2026, US-101 Southbound at Bayshore Boulevard2 vehicles, 1 injuredInjury crash
May 29, 2026, US-101 S/B at Cesar Chavez Street2 vehiclesProperty damage only
May 29, 2026, US-101 Southbound at 25TH Street Pedestrian Overcrossing2 vehiclesProperty damage only
May 29, 2026, US-101 Southbound at 23rd Street Overcrossing2 vehicles, 4 injuredInjury crash
May 29, 2026, US-101 Southbound at 23rd Street Overcrossing2 vehiclesProperty damage only

Source: CHP CCRS
Updates: Changes the state makes to this record are applied here when the source publishes them
First published here: October 25, 2026
Last updated: October 25, 2026, no changes recorded
What is left out: Names, addresses, plates, and license and insurance numbers are not in the public data and never appear here

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