Traffic Collision Blocks Lane on State Route 57

Traffic Collision on State Route 57 North in Diamond Bar Causes Delays Today

📍 Diamond Bar, CA

📅 Published: September 22, 2025 at 08:07 PM

Map showing the location of the accident in Diamond Bar, CA
Diamond Bar, September 22, 2025 -

A traffic collision involving two vehicles, a black Honda Civic and a gray Mazda, occurred today on State Route 57 North at Diamond Bar Boulevard in Diamond Bar, CA. The incident was reported around 7:23 PM, blocking the slow lane and resulting in significant traffic delays in the area.

Emergency response teams were dispatched to manage the scene, with units on site to control traffic flow and assist in clearing the roadway. The blocked lane created congestion for motorists during the evening commute, leading to backups in the vicinity of the collision.

A tow truck was requested to remove the vehicles involved in the traffic incident, and emergency services worked diligently to restore normal traffic conditions. As crews continued to address the aftermath of the collision, drivers were advised to expect delays and consider alternate routes to avoid congestion on State Route 57 North.

Traffic management efforts aimed to ensure the safety of all road users while clearing the scene. Motorists are encouraged to stay updated on traffic conditions in Diamond Bar, CA, as the situation develops and normal traffic flow is restored.

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