CA · County

San Mateo Car Accidents & Crashes

San Mateo County has recorded 3,285 traffic crashes since 2024, including 9 fatal incidents. In the last 24 hours, 18 new crashes were reported. Crash volume is highest on US-101 N/B and US-101 S/B.

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 May 29, 2026.

Breakdown by type: 2,874 accident, 411 construction.

3,285

Total Crashes

All time records

9

Fatalities

Fatal injury reports

13

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

2874 accident 411 construction

Caltrans : Roadwork on CA-82 Southbound at Oak Grove Ave (Burlingame). Lanes closed until 5 PM. From 8:00 AM Friday, May 29, 2026 to 5:00 PM Friday, May 29, 2026.

CA-82 S 11 minutes ago Live

Caltrans : Roadwork on CA-1 Northbound and Southbound at CA-84 (San Gregorio). Lane closed. One way traffic control in effect. From 7:00 AM Friday, May 29, 2026 to 5:00 PM Friday, May 29, 2026.

CA-1 S 11 minutes ago Live

Caltrans : Long-term construction on CA-82 Southbound between Peninsula Ave (Burlingame) and E Poplar Ave (San Mateo). Lane closed until 6 PM. From 5:00 PM Tuesday, May 12, 2026 to 6:00 PM Friday, August 28, 2026.

CA-82 S 11 minutes ago Live

Caltrans : Long-term construction on CA-82 Northbound between E Poplar Ave (San Mateo) and Peninsula Ave (Burlingame). Lane closed until 6 PM. From 5:00 PM Tuesday, May 12, 2026 to 6:00 PM Friday, August 28, 2026.

CA-82 N 11 minutes ago Live

Caltrans : Roadwork on CA-82 Northbound between School St (Daly City) and John Daly Blvd (Daly City). Various lanes closed until 6 AM. From 8:00 PM Thursday, May 28, 2026 to 6:00 AM Friday, May 29, 2026.

CA-82 N 7 hours, 11 minutes ago

Caltrans : Roadwork on US-101 Southbound entering at Harbor Blvd (Belmont). On Ramp closed until 6 AM. From 9:00 PM Thursday, May 28, 2026 to 6:00 AM Friday, May 29, 2026.

US-101 S 7 hours, 56 minutes ago

Caltrans : Roadwork on US-101 Northbound entering at Whipple Ave (Redwood City). On Ramp closed until 6 AM. From 7:00 PM Thursday, May 28, 2026 to 6:00 AM Friday, May 29, 2026.

US-101 N 7 hours, 56 minutes ago

Caltrans : Roadwork on US-101 Northbound exiting at Peninsula Ave (San Mateo). Off Ramp closed until 6 AM. From 9:00 PM Thursday, May 28, 2026 to 6:00 AM Friday, May 29, 2026.

US-101 N 7 hours, 56 minutes ago

Caltrans : Roadwork on US-101 Southbound entering at Ralston Ave (Belmont). On Ramp closed until 6 AM. From 9:00 PM Thursday, May 28, 2026 to 6:00 AM Friday, May 29, 2026.

US-101 S 7 hours, 56 minutes ago

Caltrans : Roadwork on US-101 Northbound entering at Peninsula Ave (San Mateo). On Ramp closed until 6 AM. From 10:00 PM Thursday, May 28, 2026 to 6:00 AM Friday, May 29, 2026.

US-101 N 7 hours, 56 minutes ago

Caltrans : Roadwork on US-101 Southbound exiting at Ralston Ave (Belmont). Off Ramp closed until 6 AM. From 9:00 PM Thursday, May 28, 2026 to 6:00 AM Friday, May 29, 2026.

US-101 S 7 hours, 56 minutes ago

Caltrans : Roadwork on US-101 Northbound exiting at Holly St (San Carlos). Off Ramp closed until 6 AM. From 9:00 PM Thursday, May 28, 2026 to 6:00 AM Friday, May 29, 2026.

US-101 N 7 hours, 56 minutes ago

Caltrans : Roadwork on US-101 Southbound entering at Whipple Ave (Redwood City). On Ramp closed until 6 AM. From 8:00 PM Thursday, May 28, 2026 to 6:00 AM Friday, May 29, 2026.

US-101 S 7 hours, 56 minutes ago

CHP : Traffic Hazard on CA-92 Eastbound west of San Mateo Bridge - Eastbound Causeway (Foster City). Left lanes affected. Expect delays.

CA-92 E 17 hours, 26 minutes ago

CHP : Traffic Collision on CA-82 Southbound at Stockbridge Ave (Atherton). Lane affected. Expect delays.

CA-82 S 20 hours, 11 minutes ago

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

Moderate Accident

US-101 N 20 hours, 11 minutes ago

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

Moderate Accident

US-101 N 20 hours, 26 minutes ago

CHP : Disabled tractor trailer on US-101 Northbound at E Hillsdale Blvd (San Mateo). Lane affected. Expect delays.

Moderate Accident

US-101 N 21 hours, 11 minutes ago

CHP : Traffic Hazard on I-280 Northbound north of CA-84 E (Woodside). Lane blocked. Expect delays.

Moderate Accident

I-280 N 21 hours, 41 minutes ago

Caltrans : Roadwork on CA-35 Northbound between CA-35 N (San Bruno) and Berkshire Dr (San Bruno). Lane closed until 3 PM. From 9:00 AM Thursday, May 28, 2026 to 3:00 PM Thursday, May 28, 2026.

CA-35 N 22 hours, 11 minutes ago

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

Moderate Accident

I-280 S 22 hours, 26 minutes ago

Caltrans : Roadwork on I-280 Southbound between Larkspur Dr (Millbrae) and Hillcrest Blvd (Millbrae). Lane closed until 2 PM. From 10:00 AM Thursday, May 28, 2026 to 2:00 PM Thursday, May 28, 2026.

I-280 S 23 hours, 11 minutes ago

CHP : Traffic Hazard on I-280 Southbound north of Farm Hill Blvd (Woodside). Center lanes affected. Expect delays.

Moderate Accident

I-280 S 1 day, 3 hours ago

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

Moderate Accident

CA-92 W 1 day, 4 hours ago

CHP : Residual delays on US-101 Southbound at University Ave (East Palo Alto). Right shoulder affected. Expect delays.

Moderate Accident

US-101 S 1 day, 4 hours ago

CHP : Traffic Hazard on CA-92 Eastbound west of Upper Skyline Blvd (Unincorporated). Center Divider blocked. Expect delays.

CA-92 E 1 day, 5 hours ago

CHP : Traffic Collision on I-280 Northbound south of CA-92 E (San Mateo). Lanes affected. Expect delays.

Moderate Accident

I-280 N 1 day, 6 hours ago

Caltrans : Roadwork on US-101 Southbound entering at E 3RD Ave (San Mateo). On Ramp closed until 6 AM. From 9:00 PM Wednesday, May 27, 2026 to 6:00 AM Thursday, May 28, 2026.

US-101 S 1 day, 7 hours ago

Caltrans : Roadwork on US-101 Northbound entering at E 3RD Ave (San Mateo). On Ramp closed until 6 AM. From 8:00 PM Wednesday, May 27, 2026 to 6:00 AM Thursday, May 28, 2026.

US-101 N 1 day, 7 hours ago

Caltrans : Roadwork on US-101 Southbound entering at E 4TH Ave (San Mateo). On Ramp closed until 6 AM. From 10:00 PM Wednesday, May 27, 2026 to 6:00 AM Thursday, May 28, 2026.

US-101 S 1 day, 7 hours ago

Caltrans : Roadwork on US-101 Northbound exiting at E 3RD Ave (San Mateo). Off Ramp closed until 6 AM. From 11:00 PM Wednesday, May 27, 2026 to 6:00 AM Thursday, May 28, 2026.

US-101 N 1 day, 7 hours ago

Caltrans : Roadwork on CA-82 Northbound between School St (Daly City) and John Daly Blvd (Daly City). Various lanes closed until 6 AM. From 8:00 PM Wednesday, May 27, 2026 to 6:00 AM Thursday, May 28, 2026.

CA-82 N 1 day, 7 hours ago

Caltrans : Roadwork on US-101 Northbound entering at E 3RD Ave (San Mateo). On Ramp closed until 6 AM. From 8:00 PM Wednesday, May 27, 2026 to 6:00 AM Thursday, May 28, 2026.

US-101 N 1 day, 9 hours ago

CHP : Traffic Hazard on CA-92 Eastbound west of Lower Skyline Blvd (Unincorporated). Left lane affected. Expect delays.

CA-92 E 1 day, 15 hours ago

CHP : Vehicle fire on I-280 Northbound ramp to CA-92 E (San Mateo). Right shoulder affected. Expect delays.

Moderate Accident

I-280 N 1 day, 18 hours ago

CHP : Traffic Collision with Injuries on I-280 Northbound north of Alpine Rd (Menlo Park). Lane blocked. Expect delays.

Moderate Accident

I-280 N 1 day, 19 hours ago

CHP : Traffic Hazard on US-101 Northbound south of E 3RD Ave (San Mateo). 2nd lane from the left blocked. Expect delays.

Moderate Accident

US-101 N 1 day, 19 hours ago

CHP : Residual delays on US-101 Northbound exiting at Willow Rd (Menlo Park). Right shoulder affected. Expect delays.

Moderate Accident

US-101 N 1 day, 20 hours ago

Caltrans : Roadwork on CA-35 Northbound between CA-35 N (San Bruno) and Berkshire Dr (San Bruno). Lane closed until 3 PM. From 9:00 AM Wednesday, May 27, 2026 to 3:00 PM Wednesday, May 27, 2026.

CA-35 N 1 day, 22 hours ago

Caltrans : Roadwork on CA-1 Northbound and Southbound at CA-84 (San Gregorio). Lane closed. One way traffic control in effect. From 7:00 AM Wednesday, May 27, 2026 to 5:00 PM Wednesday, May 27, 2026.

CA-1 S 1 day, 22 hours ago

CHP : Traffic Collision on US-101 Southbound north of Whipple Ave (Redwood City). Left lanes blocked. Expect delays.

Moderate Accident

US-101 S 2 days, 3 hours ago

CHP : Residual delays on US-101 Northbound south of Dore Ave (San Mateo). Right shoulder affected. Expect delays.

Moderate Accident

US-101 N 2 days, 5 hours ago

Caltrans : Roadwork on CA-1 Southbound at Higgins Canyon Rd (Half Moon Bay). Lane closed until 6 AM. From 10:00 PM Tuesday, May 26, 2026 to 6:00 AM Wednesday, May 27, 2026.

CA-1 S 2 days, 7 hours ago

CHP : Disabled vehicle on CA-92 Eastbound east of Lemos Farms Rd (Unincorporated). Lane blocked. Expect delays.

CA-92 E 2 days, 7 hours ago

Caltrans : Roadwork on US-101 Northbound entering at Whipple Ave (Redwood City). On Ramp closed until 6 AM. From 11:00 PM Tuesday, May 26, 2026 to 6:00 AM Wednesday, May 27, 2026.

US-101 N 2 days, 7 hours ago

CHP : Vehicle fire on US-101 Northbound exiting at E Hillsdale Blvd (San Mateo). Off Ramp closed. Expect delays.

US-101 N 2 days, 16 hours ago

CHP : Traffic Hazard on CA-92 Eastbound east of Foster City Blvd (Foster City). Center lane blocked. Expect delays.

Moderate Accident

CA-92 E 2 days, 16 hours ago

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

CA-92 E 2 days, 18 hours ago

CHP : Traffic Hazard on US-101 Southbound north of S Airport Blvd (South San Francisco). Lane affected. Expect delays.

Moderate Accident

US-101 S 2 days, 18 hours ago

CHP : Disabled vehicle on I-280 Northbound south of Sand Hill Rd (Menlo Park). Right lane blocked. Expect delays.

Moderate Accident

I-280 N 2 days, 18 hours ago