Traffic Collisions in San Mateo County

2014 – 2025
201420152016201720182019202020212022202320242025
31,567
Collisions
417
People killed
40,867
People injured
50%
On state highways

Between 2014 and 2025, 31,567 collisions were reported to the CHP in San Mateo County. They killed 417 people and injured 40,867. Annual collisions have risen 3% since 2014 — against the statewide trend. The single most common time for a crash here is 5 PM on a Thursday.

Collisions by year

2014 2,565
2015 2,674
2016 2,822
2017 3,053
2018 3,052
2019 2,980
2020 1,994
2021 2,143
2022 2,407
2023 2,548
2024 2,698
2025 2,631

When crashes happen

12 AM6 AM12 PM6 PM11 PM
Sunday 4,353
Monday 4,813
Tuesday 4,771
Wednesday 4,912
Thursday 4,945
Friday 4,180
Saturday 3,593

Roads With the Most Collisions

Freeways

  1. US-1015,880
  2. I-2802,590
  3. SR-921,550
  4. SR-11,023
  5. SR-82840
  6. SR-84604
  7. SR-35485
  8. I-380292

City Streets

  1. El Camino Real1,210
  2. Woodside Rd445
  3. Middlefield Rd408
  4. Ralston Ave254
  5. Alameda De Las Pulgas240
  6. Junipero Serra Blvd228
  7. University Ave223
  8. Broadway218

Intersections With the Most Collisions

Involving a freeway

  1. SR-92 & US-101469
  2. Marsh Rd & US-101367
  3. US-101 & Willow Rd336
  4. Millbrae Ave & US-101291
  5. US-101 & University Ave275
  6. US-101 & Whipple Ave267
  7. Foster City Blvd & SR-92244
  8. Holly St & US-101238

City streets only

  1. Junipero Serra Blvd & Westborough Blvd77
  2. Middlefield Rd & Woodside Rd76
  3. Broadway & Woodside Rd74
  4. Veterans Blvd & Whipple Ave62
  5. Donohoe St & University Ave57
  6. Holly St & Industrial Rd42
  7. Center St & El Camino Real41
  8. Gellert Blvd & Hickey Blvd39

Driving in San Mateo County?

Compare your route against every one of these 31,567 collisions and take the one with the fewest.

Plan a safer route

Source: California Highway Patrol Statewide Integrated Traffic Records System (SWITRS), via the Transportation Injury Mapping System at UC Berkeley. Figures cover collisions reported to the CHP; minor crashes that were never reported do not appear. Road and intersection names are as recorded by the reporting officer.