Major Collision Disrupts Traffic in Diamond Bar

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

📍 Diamond Bar, CA

📅 Published: May 13, 2025 at 08:32 PM

🔄 Updated: May 13, 2025 at 09:04 PM

Map showing the location of the accident in Diamond Bar, CA
Diamond Bar, May 13, 2025 -

A traffic collision involving two vehicles occurred today at the intersection of State Route 57 North and Grand Avenue On-Ramp in Diamond Bar, CA. The incident, reported around 7:49 PM, involved a grey SUV and an unknown vehicle associated with a big rig driver. The collision has led to significant traffic impact, blocking the slow lane and partially obstructing the High-Occupancy Vehicle (HOV) lane.

Emergency units quickly arrived at the scene to manage traffic and ensure safety. One of the vehicles involved is leaking fluid and is not movable, while the other sustained rear-end damage. A tow truck has been requested to assist in clearing the roadway, but as of now, traffic congestion is expected in the area due to the blockage.

Motorists traveling through this section of State Route 57 North should anticipate delays and consider alternate routes to avoid the affected lanes. The California Highway Patrol is on-site, directing traffic and working to resolve the situation as efficiently as possible.

As the evening commute continues, drivers are advised to remain cautious and alert while navigating around the traffic incident in Diamond Bar, CA. Further updates will be provided as the situation develops and lanes are cleared.

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