Multi-Vehicle Collision Disrupts Morning Commute

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

📍 Diamond Bar, CA

📅 Published: July 17, 2025 at 09:04 AM

🔄 Updated: July 17, 2025 at 10:00 AM

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

A significant traffic collision occurred today on State Route 57 South near Diamond Bar Boulevard in Diamond Bar, CA, involving five vehicles. The incident took place during the busy morning commute at approximately 7:15 AM, blocking the high-occupancy vehicle (HOV) lane and other lanes, which led to considerable traffic delays and congestion in the area.

The vehicles involved in the crash included a silver Mercedes C300, a gold pickup truck, a grey Honda, a white Honda, and a grey Lexus. Emergency response units quickly arrived on the scene to manage traffic and direct vehicles away from the blockage. Despite their prompt arrival, the collision caused a significant backup that persisted until the roadway was cleared around 9:30 AM.

Tow trucks were called to assist with the removal of the damaged vehicles, further contributing to the delays experienced by commuters. As the scene was cleared, traffic began to resume normal operations, alleviating the congestion that had built up during the incident.

Motorists are advised to remain cautious in the area as residual delays may still be present. This traffic incident highlights the importance of safe driving practices, especially during peak travel times.

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