Major Traffic Disruption on State Route 57

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

📍 Diamond Bar, CA

📅 Published: August 18, 2025 at 12:06 AM

🔄 Updated: August 18, 2025 at 05:00 AM

Map showing the location of the accident in Diamond Bar, CA
Diamond Bar, August 17, 2025 -

A traffic collision on State Route 57 North at State Route 60 East in Diamond Bar, CA, caused significant traffic disruptions today. The incident involved one vehicle, a blue sedan, which was reported to be blocking multiple lanes after the crash. Emergency services responded quickly to manage the scene and traffic flow, initially closing all lanes except for the High-Occupancy Vehicle (HOV) lane for approximately 20 minutes.

As the situation developed, traffic was halted, leading to considerable delays and congestion for motorists in the area. A tow truck was called to remove the vehicle, allowing for the gradual reopening of the lanes. By 12:45 AM, all lanes were cleared and reopened to traffic, alleviating the backup that had formed during the incident.

Motorists in Diamond Bar, CA, should remain cautious as residual delays may linger following the traffic incident. The California Highway Patrol worked diligently to ensure the safe management of the roadway and to restore normal traffic conditions as quickly as possible.

Drivers are advised to stay updated on traffic conditions and to plan alternative routes if necessary. This collision serves as a reminder of the importance of safe driving practices and the potential for unexpected traffic incidents on busy highways.

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