Multi-Vehicle Collision Causes Major Traffic Delays

Traffic Collision on State Route 57 South in Diamond Bar Causes Lane Blockages Today

📍 Diamond Bar, CA

📅 Published: September 12, 2025 at 04:24 PM

🔄 Updated: September 12, 2025 at 05:35 PM

Map showing the location of the accident in Diamond Bar, CA
Diamond Bar, September 12, 2025 -

A traffic collision involving four vehicles occurred today on State Route 57 South at the Temple East on-ramp in Diamond Bar, CA. The incident took place during the busy afternoon traffic hours, impacting the flow of vehicles in the area. The vehicles involved included a gray Lexus ES300h, a white Mercedes SUV, a Honda, and a motorcycle.

As a result of the collision, lanes one and two were blocked, leading to significant traffic congestion. Emergency response teams quickly arrived to manage the scene and ensure safety. Multiple units worked to control the situation, addressing the lane closures effectively.

By approximately 4:41 PM, all lanes were reopened, allowing traffic to resume its normal flow. The roadway was cleared of debris, including coolant leakage from one of the vehicles involved in the incident.

Motorists traveling through Diamond Bar, CA, are advised to remain cautious as residual delays may persist following the traffic incident. Drivers should stay informed about traffic conditions and consider alternative routes if necessary.

This traffic collision highlights the importance of safe driving practices, particularly during peak travel times.

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