Major Traffic Disruption in Diamond Bar Collision

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

📍 Diamond Bar, CA

📅 Published: September 18, 2025 at 03:35 PM

Map showing the location of the accident in Diamond Bar, CA
Diamond Bar, September 18, 2025 -

A traffic collision involving a motorcycle and another vehicle occurred today in Diamond Bar, CA, specifically in the transition area from Northbound State Route 57 to Westbound State Route 60. The incident was reported around 2:36 PM and has resulted in significant traffic disruptions.

Both vehicles involved in the collision have been left on the roadway, prompting a response from multiple traffic management units. These units are actively managing the scene and directing traffic to alleviate congestion. As a result of the incident, lane closures have been implemented in the transition area, causing delays for drivers traveling through this busy corridor.

Towing services have been called to the scene, with an estimated arrival time of approximately 20 minutes. Traffic management officials have issued a signal alert for the Northbound State Route 57 to Westbound State Route 60 transition, specifically affecting the first and second lanes. Motorists are advised to seek alternative routes to avoid potential backups and delays.

This traffic incident serves as a reminder for drivers to exercise caution in busy areas, particularly during peak travel times. It is essential for motorists to remain aware of their surroundings and to follow any detours or instructions provided by traffic management personnel.

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