Major Traffic Disruption on US Highway 101

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

📍 San Mateo, CA

📅 Published: August 26, 2025 at 01:32 AM

Map showing the location of the accident in San Mateo, CA
San Mateo, August 26, 2025 -

A traffic collision occurred today at the Hillsdale Boulevard On-Ramp to US Highway 101 South in San Mateo, CA, leading to significant traffic disruptions. The incident involved two vehicles: a silver Jeep with front-end damage and a silver small SUV that struck a barrier. The collision was reported around 12:42 AM, and shortly after, the second vehicle impacted the barrier, resulting in lane blockages.

As a consequence of the collision, at least one vehicle was designated for towing, prompting a response from multiple units for traffic control and management. The blocked lanes created delays for motorists during the early morning hours, causing congestion in the area.

Local law enforcement was called to assist with traffic control at approximately 1:06 AM to help manage the flow of vehicles and ensure safety. A tow truck was requested shortly thereafter to remove the damaged vehicles from the scene.

Motorists are advised to seek alternate routes to avoid potential backups and delays near the Hillsdale Boulevard On-Ramp to US Highway 101 South as crews continue to address the aftermath of this traffic incident.

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