Major Traffic Disruption on US-101 in San Mateo

Traffic Collision on US-101 in San Mateo Causes Delays Today

📍 San Mateo, CA

📅 Published: October 4, 2025 at 12:34 PM

Map showing the location of the accident in San Mateo, CA
San Mateo, October 4, 2025 -

A traffic collision occurred today on northbound US-101 near Peninsula Avenue in San Mateo, CA, involving four vehicles. The incident was reported at approximately 11:43 AM and included a grey Hyundai Ioniq 5, a silver Lexus IS350, a white Tesla Model Y, and an unknown vehicle, possibly an SUV.

As a result of the collision, lanes one and two were blocked, leading to significant traffic delays and congestion for drivers during the morning commute. Emergency services responded quickly, deploying multiple units to manage the scene and control traffic flow. A tow truck was arranged for the removal of the vehicles that were rendered not drivable due to the crash.

Traffic was heavily impacted, with slow lane conditions reported along the northbound side of US-101. The California Department of Transportation issued a signal alert, advising motorists to expect delays in the area. Drivers are encouraged to seek alternate routes to avoid the backup caused by this traffic incident.

As the situation unfolds, motorists should remain cautious and stay updated on traffic conditions in San Mateo, CA. The California Highway Patrol is actively managing the scene to ensure that the roadways are cleared as quickly and safely as possible.

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