Major Multi-Vehicle Collision Causes Traffic Chaos

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

📍 Diamond Bar, CA

📅 Published: September 20, 2025 at 10:32 PM

🔄 Updated: September 20, 2025 at 11:04 PM

Map showing the location of the accident in Diamond Bar, CA
Diamond Bar, September 20, 2025 -

A significant traffic collision occurred today on State Route 57 North near the Diamond Bar Boulevard off-ramp in Diamond Bar, CA. The incident involved six vehicles, including a white sedan, a light-colored sedan, a black Chevrolet that appeared silver, an unknown vehicle, a white Lexus four-door sedan, and a black pickup truck.

The collision resulted in lane blockages in lanes three and four, leading to substantial traffic congestion and delays for drivers in the area. Emergency response units were dispatched to manage the scene and direct traffic, ensuring safety for all motorists. Tow services were also called to assist in clearing the vehicles involved in the incident.

As the situation unfolded, traffic was significantly impacted, with backup reported on the roadway. Motorists traveling through this section of State Route 57 North should expect delays and consider alternative routes while emergency crews work to restore normal traffic flow.

Drivers are urged to exercise caution and remain alert as they navigate the affected area. The emergency response teams are actively engaged in managing the situation, and updates will be provided as the scene is cleared.

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