Major Traffic Collision Closes Lanes on SR-57

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

📍 San Dimas, CA

📅 Published: August 9, 2025 at 10:46 PM

🔄 Updated: August 10, 2025 at 02:00 AM

Map showing the location of the accident in San Dimas, CA
San Dimas, August 9, 2025 -

A significant traffic collision occurred today on Southbound State Route 57 (SR-57) near State Route 71 (SR-71) in San Dimas, CA, leading to major traffic disruptions. The incident involved three vehicles: a white Honda sedan, a white Chevrolet Suburban with front damage, and another vehicle not specified in detail.

As a result of the traffic incident, multiple lanes on Southbound SR-57 were closed, including several lanes upstream and closures on the arrow ramps. State traffic management teams were actively engaged in setting up these closures to ensure safety and facilitate the emergency response. The traffic collision has caused significant delays, creating backups for motorists in the area.

Emergency response teams, including several units from the California Highway Patrol, were dispatched to control and secure the scene. Their efforts focused on minimizing congestion and restoring normal traffic flow as quickly as possible. Motorists are advised to seek alternative routes and expect delays if traveling through this area.

This traffic incident highlights the importance of cautious driving and awareness on the road, particularly during peak travel times. Updates on the situation will be provided as more information becomes available.

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