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San Mateo Car Accidents & Crashes

San Mateo County has recorded 6,748 traffic crashes since 2024, including 10 fatal incidents. In the last 24 hours, 27 new crashes were reported. Crash volume is highest on US-101 N and US-101 S.

Data is sourced from the California Crash Records System (CCRS), maintained by the California Highway Patrol and updated daily, and the CA 511 live incident feed, refreshed every 15 minutes. CCRS records include party details, injury severity, vehicle information, and precise geographic coordinates. Last updated Nov. 4, 2026.

Breakdown by type: 1,247 accident, 594 construction.

1,841

Total Crashes

Filtered results

0

Fatalities

Fatal injury reports

12

Today

Reported since midnight

Today's Accidents Today's Fatalities

showing most recent 500 incidents with location data · click a marker to view details

Crash Records

San Mateo Incidents 1,841 results

1247 accident 594 construction

Caltrans : Roadwork on CA-82 Northbound between E Poplar Ave (San Mateo) and Peninsula Ave (Burlingame). Lane closed until 6 PM. From 4:00 PM Friday, August 28, 2026 to 6:00 PM Friday, December 04, 2026.

CA-82 N 8 minutes ago Live

Caltrans : Roadwork on CA-82 Southbound between Broadway (Burlingame) and Oak Grove Ave (Burlingame). Lane closed until 6 PM. From 4:00 PM Friday, August 28, 2026 to 6:00 PM Friday, December 04, 2026.

CA-82 S 8 minutes ago Live

Caltrans : Roadwork on CA-82 Southbound between Peninsula Ave (Burlingame) and E Poplar Ave (San Mateo). Lane closed until 6 PM. From 4:00 PM Friday, August 28, 2026 to 6:00 PM Friday, December 04, 2026.

CA-82 S 8 minutes ago Live

CHP : Traffic Hazard on CA-92 Westbound at De Anza Blvd (San Mateo). Off Ramp blocked. Expect delays.

CA-92 W 4 hours, 23 minutes ago

CHP : Disabled vehicle on US-101 Southbound north of Holly St (San Carlos). 2nd lane from the left blocked. Expect delays.

Moderate Accident

US-101 S 6 hours, 8 minutes ago

CHP : Traffic Hazard on US-101 Southbound south of E Hillsdale Blvd (San Mateo). Lane affected. Expect delays.

Moderate Accident

US-101 S 6 hours, 8 minutes ago

Caltrans : Roadwork on CA-92 Eastbound exiting at S Delaware St (San Mateo). Off Ramp closed until 6 AM. From 8:00 PM Tuesday, November 03, 2026 to 6:00 AM Wednesday, November 04, 2026.

CA-92 E 6 hours, 38 minutes ago

CHP : Traffic Collision on US-101 Northbound exiting at E 3RD Ave (San Mateo). Left lane blocked. Expect delays.

Moderate Accident

US-101 N 8 hours, 8 minutes ago

CHP : Disabled vehicle on US-101 Northbound north of S Airport Blvd (South San Francisco). Right lane blocked. Expect delays.

Moderate Accident

US-101 N 8 hours, 38 minutes ago

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

Moderate Accident

US-101 N 8 hours, 38 minutes ago

CHP : Traffic Collision on US-101 Northbound south of Redwood Shores Pky (San Carlos). Lane affected. Expect delays.

Moderate Accident

US-101 N 8 hours, 53 minutes ago

CHP : Traffic Hazard on US-101 Southbound at CA-92 W (San Mateo). Right lane affected. Expect delays.

Moderate Accident

US-101 S 9 hours, 53 minutes ago

CHP : Traffic Collision on US-101 Northbound south of Redwood Shores Pky (San Carlos). Left lane blocked. Expect delays.

Moderate Accident

US-101 N 10 hours, 8 minutes ago

CHP : Traffic Collision on I-280 Northbound exiting at Golf Course Dr (Unincorporated). Left lane blocked. Expect delays.

Moderate Accident

I-280 N 10 hours, 23 minutes ago

CHP : Traffic Collision on CA-35 Northbound at Old La Honda Rd (Portola Valley). Lane affected. Expect delays.

Moderate Accident

CA-35 N 11 hours, 8 minutes ago

CHP : Severe traffic alert and Traffic Collision on I-280 Southbound north of John Daly Blvd (Daly City). Right lanes blocked. Expect delays.

I-280 S 11 hours, 23 minutes ago

Caltrans : Roadwork on I-280 Northbound entering at Trousdale Dr (Burlingame). On Ramp closed until 4 PM. From 8:00 AM Tuesday, November 03, 2026 to 4:00 PM Tuesday, November 03, 2026.

I-280 N 11 hours, 38 minutes ago

Caltrans : Roadwork on CA-84 Westbound at CA-35 (Woodside). Lane closed. One way traffic control in effect. From 9:00 AM Tuesday, November 03, 2026 to 3:00 PM Tuesday, November 03, 2026.

CA-84 W 12 hours, 53 minutes ago

Caltrans : Roadwork on CA-35 Southbound at La Honda Rd (Woodside). Lane closed. One way traffic control in effect. From 9:00 AM Tuesday, November 03, 2026 to 3:00 PM Tuesday, November 03, 2026.

CA-35 S 12 hours, 53 minutes ago

CHP : Traffic Hazard on CA-92 Westbound east of San Mateo Bridge - High Rise (Foster City). Left and center lanes blocked. Expect delays.

CA-92 W 13 hours, 23 minutes ago

CHP : Traffic Collision on US-101 Southbound exiting at Holly St (San Carlos). Right lane blocked. Expect delays.

Moderate Accident

US-101 S 14 hours, 38 minutes ago

CHP : Traffic Collision on CA-1 Northbound south of Serramonte Blvd (Daly City). Lane affected. Expect delays.

Moderate Accident

CA-1 N 14 hours, 38 minutes ago

CHP : Traffic Hazard on CA-92 Eastbound west of W Hillsdale Blvd (San Mateo). Lane affected. Expect delays.

Moderate Accident

CA-92 E 15 hours, 53 minutes ago

CHP : Traffic Hazard on I-280 Southbound south of I-280 S-CA-92 W Ramp (San Mateo). Right lane blocked. Expect delays.

Moderate Accident

I-280 S 16 hours, 38 minutes ago

CHP : Disabled bus on CA-92 Westbound at San Mateo Bridge - High Rise (Foster City). Right lane blocked. Expect delays.

Moderate Accident

CA-92 W 16 hours, 53 minutes ago

CHP : Traffic Hazard on CA-92 Westbound west of San Mateo Bridge - High Rise (Foster City). Right lane blocked. Expect delays.

Moderate Accident

CA-92 W 18 hours, 23 minutes ago

CHP : Disabled vehicle on US-101 Northbound south of E 3RD Ave (San Mateo). Left lanes blocked. Expect delays.

Moderate Accident

US-101 N 19 hours, 38 minutes ago

CHP : Traffic Hazard on I-280 Northbound north of Junipero Serra Blvd (Daly City). 2nd lane from the left blocked. Expect delays.

Moderate Accident

I-280 N 19 hours, 38 minutes ago

CHP : Traffic Hazard on I-280 Northbound north of John Daly Blvd (Daly City). 2nd lane from the left affected. Expect delays.

Moderate Accident

I-280 N 20 hours, 23 minutes ago

CHP : Traffic Hazard on CA-92 Westbound east of San Mateo Bridge - High Rise (Foster City). Left lane affected. Expect delays.

Moderate Accident

CA-92 W 21 hours, 8 minutes ago

Caltrans : Roadwork on CA-92 Westbound exiting at W Hillsdale Blvd (San Mateo). Off Ramp closed until 7 AM. From 8:00 PM Monday, November 02, 2026 to 7:00 AM Tuesday, November 03, 2026.

CA-92 W 21 hours, 38 minutes ago

Caltrans : Roadwork on CA-82 Northbound exiting at E Hillsdale Blvd (San Mateo). Off Ramp closed. Expect delays. From 8:00 PM Monday, November 02, 2026 to 12:00 PM Tuesday, November 03, 2026.

CA-82 N 21 hours, 38 minutes ago

Caltrans : Roadwork on CA-92 Eastbound exiting at W Hillsdale Blvd (San Mateo). Off Ramp closed until 6 AM. From 8:00 PM Monday, November 02, 2026 to 6:00 AM Tuesday, November 03, 2026.

CA-92 E 22 hours, 38 minutes ago

Caltrans : Roadwork on CA-92 Eastbound exiting at Alameda De Las Pulgas (San Mateo). Off Ramp closed until 6 AM. From 8:00 PM Monday, November 02, 2026 to 6:00 AM Tuesday, November 03, 2026.

CA-92 E 22 hours, 38 minutes ago

CHP : Traffic Collision with Injuries on US-101 Southbound at Ralston Ave (Belmont). Right shoulder affected. Expect delays.

Moderate Accident

US-101 S 23 hours, 23 minutes ago

Caltrans : Roadwork on US-101 Northbound entering at E 3RD Ave (San Mateo). On Ramp closed until 6 AM. From 9:00 PM Monday, November 02, 2026 to 6:00 AM Tuesday, November 03, 2026.

US-101 N 23 hours, 23 minutes ago

Caltrans : Roadwork on US-101 Southbound between CA-92 W (San Mateo) and E Hillsdale Blvd (San Mateo). Various lanes closed until 5 AM. From 8:00 PM Monday, November 02, 2026 to 5:00 AM Tuesday, November 03, 2026.

US-101 S 23 hours, 23 minutes ago

Caltrans : Roadwork on US-101 Northbound between Woodside Rd (Redwood City) and Whipple Ave (Redwood City). Various lanes closed until 5 AM. From 10:00 PM Monday, November 02, 2026 to 5:00 AM Tuesday, November 03, 2026.

US-101 N 23 hours, 23 minutes ago

Caltrans : Roadwork on US-101 Northbound entering at E 3RD Ave (San Mateo). On Ramp closed until 6 AM. From 8:00 PM Monday, November 02, 2026 to 6:00 AM Tuesday, November 03, 2026.

US-101 N 23 hours, 23 minutes ago

Caltrans : Roadwork on US-101 Northbound entering at E 3RD Ave (San Mateo). On Ramp closed until 6 AM. From 9:00 PM Monday, November 02, 2026 to 6:00 AM Tuesday, November 03, 2026.

US-101 N 23 hours, 23 minutes ago

CHP : Vehicle fire on US-101 Southbound north of University Ave (East Palo Alto). Lane affected. Expect delays.

Moderate Accident

US-101 S 1 day, 1 hour ago

Caltrans : Roadwork on US-101 Northbound between E Hillsdale Blvd (San Mateo) and Kehoe Ave (San Mateo). Lanes closed until 4 AM. From 9:00 PM Monday, November 02, 2026 to 4:00 AM Tuesday, November 03, 2026.

US-101 N 1 day, 5 hours ago

Caltrans : Roadwork on US-101 Southbound between S Airport Blvd (South San Francisco) and San Bruno Ave E (San Bruno). Lanes closed until 4 AM. From 9:00 PM Monday, November 02, 2026 to 4:00 AM Tuesday, November 03, 2026.

US-101 S 1 day, 5 hours ago

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

Moderate Accident

US-101 N 1 day, 5 hours ago

CHP : Traffic Collision with Injuries on US-101 Northbound south of CA-92 W (San Mateo). 2nd lane from the left affected. Expect delays.

Moderate Accident

US-101 N 1 day, 5 hours ago

CHP : Traffic Hazard on I-280 Southbound south of San Bruno Ave W (San Bruno). Lane affected. Expect delays.

Moderate Accident

I-280 S 1 day, 6 hours ago

CHP : Traffic Hazard on CA-35 Northbound north of Phleger Rd (Unincorporated). Lanes affected. Expect delays.

Moderate Accident

CA-35 N 1 day, 8 hours ago

CHP : Traffic Collision with Injuries and Overturned vehicle on CA-92 Eastbound and Westbound east of Lower Skyline Blvd (Unincorporated). One way traffic control is in effect. Expect delays.

CA-92 E 1 day, 8 hours ago

CHP : Traffic Collision with Injuries and Overturned vehicle on CA-92 Eastbound and Westbound east of Lower Skyline Blvd (Unincorporated). One way traffic control is in effect. Expect delays.

CA-92 W 1 day, 8 hours ago

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

Moderate Accident

I-280 N 1 day, 9 hours ago