Multi-Vehicle Collision Disrupts Traffic on SR-57

Traffic Collision on State Route 57 North in San Dimas Causes Delays Today

📍 San Dimas, CA

📅 Published: August 19, 2025 at 10:09 AM

Map showing the location of the accident in San Dimas, CA
San Dimas, August 19, 2025 -

A traffic collision involving three vehicles occurred today on State Route 57 North near Arrow Highway in San Dimas, CA. The incident was reported around 9:17 AM and involved a grey Toyota RAV4, a white vehicle, and another vehicle of unknown description. The collision took place on the left shoulder, leading to temporary lane blockages and ramp closures in the area.

Emergency response units were promptly dispatched to manage the situation and ensure traffic safety. Multiple units arrived on the scene to control traffic flow and minimize congestion. As the response progressed, the northbound ramp was later reopened, allowing for the resumption of normal traffic patterns.

Motorists traveling through this area during the morning commute experienced delays and backups as crews worked to clear the scene. The incident underscores the need for caution while driving, especially during peak traffic hours.

Drivers are advised to remain alert and expect potential delays near State Route 57 North and Arrow Highway as traffic returns to normal. Authorities are actively working to ensure safe passage for vehicles and reduce any further disruptions.

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