Major Traffic Disruptions on State Route 60

Traffic Collision on State Route 60 in Diamond Bar Causes Significant Delays Today

📍 Diamond Bar, CA

📅 Published: September 12, 2025 at 04:33 AM

🔄 Updated: September 12, 2025 at 08:30 AM

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

A traffic collision on the eastbound State Route 60 near Diamond Bar Boulevard in Diamond Bar, CA, caused significant traffic disruptions this morning. The incident involved three vehicles: a Toyota, a white sedan, and a black Honda.

The collision was reported at approximately 3:54 AM and resulted in lane closures, including the High Occupancy Vehicle (HOV) lane and adjacent lanes, leading to heavy congestion during the morning commute. Emergency response units were quickly dispatched to the scene to manage traffic flow and secure the area.

By 4:12 AM, responders were actively working to open the HOV lane to alleviate traffic backups. All three vehicles were double hooked and towed from the scene, contributing to delays as crews worked to clear the roadway.

As of 5:19 AM, the roadway was cleared, although small debris remained, which was expected to dissipate with ongoing traffic. Motorists traveling through this area should anticipate residual delays as traffic resumes normal flow.

The California Highway Patrol continues to monitor the situation to ensure safe passage for all drivers. For those planning to travel on State Route 60, it is advisable to seek alternate routes or allow for extra travel time due to the lingering effects of this traffic incident.

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