Major Traffic Delays After Collision in Diamond Bar

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

📍 Diamond Bar, CA

📅 Published: July 5, 2025 at 12:03 PM

🔄 Updated: July 5, 2025 at 12:35 PM

Map showing the location of the accident in Diamond Bar, CA
Diamond Bar, July 5, 2025 -

A traffic collision involving two vehicles occurred today at the intersection of State Route 57 North and Grand Avenue in Diamond Bar, CA. The incident, which took place around 11:44 AM, involved a blue Nissan and a grey/white Toyota Camry. The collision has resulted in the blockage of the left lane on southbound Grand Avenue, causing significant traffic delays in the area.

Emergency response units promptly arrived to manage the situation and control traffic flow. As a result of the collision, drivers are experiencing backups and congestion, particularly during the busy morning commute. The vehicles involved remain at the scene while traffic management efforts continue to clear the area and restore normal conditions.

Motorists are advised to seek alternate routes to avoid potential delays caused by this traffic incident. The California Highway Patrol is actively working to ensure safety and facilitate the smooth flow of traffic as they address the situation.

Updates will be provided as the situation develops, informing the public about any changes in traffic conditions. Drivers are encouraged to remain vigilant and drive cautiously in the area as emergency responders work to resolve the incident.

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