San Mateo · Last 48 Hours

San Mateo Accidents Today

21 accidents near San Mateo in the last 24 hours · 47 in 48 hours · updated May 23, 2026 4:32 PM PDT

21

Last 24h

47

Last 48h

2

High Severity

128

This Week

40

Accident

7

Construction

7-Day Trend

128 crashes

↓ Fewer than last week

128 crashes in the last 7 days, down 18% vs the previous week.

Last hour

1 incident

CHP : Traffic Collision on I-280 Southbound south of Avalon Dr (South San Francisco). Lane affected. Expect delays.

Last 6 hours

7 incidents

CHP : Traffic Collision on CA-35 Northbound at Westmoor Ave (Daly City). Lane blocked. Expect delays.

CHP : Traffic Hazard on I-280 Southbound at Serramonte Blvd (Daly City). Left lane affected. Expect delays.

CHP : Traffic Hazard on I-280 Southbound north of Sneath Ln (San Bruno). Left lane blocked. Expect delays.

CHP : Traffic Hazard on I-280 Southbound north of Edgewood Rd (Unincorporated). Right shoulder affected. Expect delays.

CHP : Vehicle fire on US-101 Southbound south of Willow Rd (Menlo Park). Right lane blocked. Expect delays.

CHP : Residual delays on US-101 Northbound south of Oyster Point Blvd (South San Francisco). Center Divider affected. Expect delays.

4h ago 11:45 AM

CHP : Traffic Collision on I-280 Northbound north of I-280 N-CA-1 N Split (Daly City). On Ramp affected. Expect delays.

6–12 hours ago

6 incidents

6h ago 10:30 AM

CHP : Traffic Hazard on US-101 Southbound north of Sister Cities Blvd (South San Francisco). Left lanes affected. Expect delays.

CHP : Traffic Hazard on US-101 Southbound at Broadway (Burlingame). Right lane blocked. Expect delays.

Caltrans : Roadwork on US-101 Southbound at E Hillsdale Blvd (San Mateo). Lane closed. Expect delays. From 6:30 AM Saturday, May 23, 2026 to 12:00 PM Saturday, May 23, 2026.

10h ago 6:30 AM

CHP : Traffic Hazard on I-280 Southbound south of Washington St (Daly City). Right shoulder affected. Expect delays.

10h ago 6:30 AM

CHP : Traffic Hazard on CA-35 Southbound west of CA-92 E (Unincorporated). Right shoulder blocked. Expect delays.

11h ago 5:00 AM

CHP : Traffic Collision with Injuries on CA-92 Westbound east of San Mateo Bridge - High Rise (Foster City). Right shoulder blocked. Expect delays.

12–24 hours ago

7 incidents

14h ago 2:00 AM

CHP : Traffic Collision on CA-92 Westbound west of San Mateo Bridge - High Rise (Foster City). Lane affected. Expect delays.

17h ago 10:45 PM

CHP : Traffic Collision on US-101 Northbound south of S Airport Blvd (South San Francisco). Right shoulder affected. Expect delays.

19h ago 9:00 PM

CHP : Disabled vehicle on I-280 Northbound south of I-280 N-CA-1 N Split (Daly City). Lane affected. Expect delays.

21h ago 7:15 PM

CHP : Traffic Hazard on I-280 Northbound south of Golf Course Dr (Unincorporated). Lane affected. Expect delays.

21h ago 7:00 PM

CHP : Traffic Hazard on US-101 Southbound north of CA-92 E (San Mateo). 2nd lane from the left blocked. Expect delays.

22h ago 6:30 PM

CHP : Traffic Hazard on US-101 Southbound north of Ralston Ave (Belmont). Lane affected. Expect delays.

23h ago 4:45 PM

CHP : Traffic Hazard on US-101 Northbound south of Woodside Rd (Redwood City). Lanes blocked. Expect delays.

24–48 hours ago

26 incidents

CHP : Traffic Hazard on US-101 Northbound south of Marsh Rd (Menlo Park). Lane affected. Expect delays.

CHP : Traffic Collision on I-280 Northbound north of Hickey Blvd (Daly City). Right lane blocked. Expect delays.

CHP : Traffic Hazard on I-280 Northbound south of CA-92 E (San Mateo). Right lane blocked. Expect delays.

CHP : Traffic Collision on US-101 Northbound south of E Hillsdale Blvd (San Mateo). Right lane blocked. Expect delays.

CHP : Residual delays on US-101 Southbound north of Woodside Rd (Redwood City). Right shoulder affected. Expect delays.

CHP : Traffic Collision on US-101 Southbound north of Woodside Rd (Redwood City). Right lane blocked. Expect delays.

CHP : Traffic Hazard on I-280 Northbound north of Farm Hill Blvd (Woodside). 3rd lane from the left blocked. Expect delays.

1d ago 12:30 PM

CHP : Vehicle fire on US-101 Southbound north of I-380 W (South San Francisco). Right shoulder affected. Expect delays.

1d ago 12:00 PM

CHP : Traffic Hazard on I-280 Southbound north of CA-92 E (San Mateo). Lane blocked. Expect delays.

1d ago 11:00 AM

CHP : Traffic Collision with Injuries on US-101 Northbound north of Willow Rd (Menlo Park). Lane blocked. Expect delays.

1d ago 10:30 AM

CHP : Traffic Collision on US-101 Northbound south of Woodside Rd (Redwood City). Left lanes blocked. Expect delays.

1d ago 10:15 AM

CHP : Disabled vehicle on CA-92 Westbound east of San Mateo Bridge - High Rise (Foster City). Lane affected. Expect delays.

1d ago 10:00 AM

Caltrans : Scheduled roadwork on CA-82 Northbound at Oak Grove Ave (Burlingame). All lanes closed. Avoid the area. From 9:45 AM Friday, May 22, 2026 to 6:00 PM Friday, May 22, 2026.

Caltrans : Roadwork on CA-82 Northbound and Southbound south of Oak Grove Ave (Burlingame). All lanes closed until 6 PM. From 9:00 AM Friday, May 22, 2026 to 6:00 PM Friday, May 22, 2026.

CHP : Traffic Collision on US-101 Southbound north of E Hillsdale Blvd (San Mateo). Center Divider affected. Expect delays.

CHP : Disabled vehicle on CA-92 Eastbound west of San Mateo Bridge - High Rise (Foster City). Right lane blocked. Expect delays.

CHP : Residual delays on US-101 Northbound ramp to CA-92 E (San Mateo). All lanes open. Expect delays.

Caltrans : Roadwork on CA-1 Southbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 11 AM. From 7:00 PM Thursday, May 21, 2026 to 11:00 AM Friday, May 22, 2026.

Caltrans : Roadwork on CA-1 Southbound at CA-92 E (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Thursday, May 21, 2026 to 6:00 AM Friday, May 22, 2026.

Caltrans : Roadwork on CA-92 Westbound at De Anza Blvd (San Mateo). Right shoulder closed until 6 AM. From 10:00 PM Thursday, May 21, 2026 to 6:00 AM Friday, May 22, 2026.

Caltrans : Roadwork on CA-82 Northbound between School St (Daly City) and John Daly Blvd (Daly City). Various lanes closed until 2 AM. From 8:00 PM Thursday, May 21, 2026 to 2:00 AM Friday, May 22, 2026.

CHP : Traffic Hazard on I-280 Northbound south of CA-84 E (Woodside). 2nd lane from the left affected. Expect delays.

CHP : Traffic Collision on I-280 Northbound south of Alpine Rd (Menlo Park). Lane affected. Expect delays.

CHP : Residual delays on I-280 Northbound north of Hickey Blvd (Daly City). Center Divider affected. Expect delays.

CHP : Traffic Collision on I-280 Northbound south of Avalon Dr (South San Francisco). Lane blocked. Expect delays.

CHP : Disabled vehicle on US-101 Northbound south of Airport Exit (Millbrae). 2nd lane from the left affected. Expect delays.

Frequently Asked Questions

Are accidents in San Mateo reported live?

Yes — this page refreshes throughout the day as new incidents are logged by the California Highway Patrol. Crash data typically appears within 15–30 minutes of being reported.

How many accidents happened near San Mateo in the last 7 days?

128 crashes were reported near San Mateo in the last 7 days.

What roads have the most crashes in San Mateo today?

Recent crashes near San Mateo are concentrated on: US-101 S, I-280 N, US-101 N. See the full historical crash data for San Mateo.

What type of accident is most common in San Mateo?

Accident are the most frequently reported incident type near San Mateo based on recent data.

Where does this crash data come from?

Crash data is sourced from the California Highway Patrol (CHP) Computer-Aided Dispatch feed and the CCRS historical crash database. Learn more about our data sources.