Multi-Vehicle Collision Disrupts Traffic in Diamond Bar

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

📍 Diamond Bar, CA

📅 Published: September 22, 2025 at 05:37 PM

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

A traffic collision on State Route 57 North in Diamond Bar, CA, caused temporary traffic impacts today during the late afternoon. The incident, which occurred around 4:45 PM, involved four vehicles: a grey Toyota Yaris, a gold Toyota Venza, a Honda, and an unknown vehicle. All vehicles were reported as drivable following the crash.

Emergency services quickly arrived at the scene to manage traffic and ensure safety. Initial lane control was established to monitor the situation, helping to minimize congestion during the busy afternoon commute. Although there were temporary traffic impacts, the roadway was monitored closely, and emergency responders worked efficiently to clear the area.

During the incident, a white truck and a second unknown vehicle reportedly left the scene before emergency personnel arrived. Despite the presence of multiple vehicles, there were no significant delays or backups reported in traffic flow.

Motorists traveling along State Route 57 North should remain aware of potential residual traffic impacts as emergency services conclude their operations. Drivers are encouraged to stay alert and follow any posted detours or instructions from traffic management personnel.

This traffic collision highlights the importance of caution and vigilance on the roads, especially during peak travel times.

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