Major Traffic Disruptions on State Route 57

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

📍 Diamond Bar, CA

📅 Published: August 11, 2025 at 10:02 PM

Map showing the location of the accident in Diamond Bar, CA
Diamond Bar, August 11, 2025 -

A traffic collision on State Route 57 South in Diamond Bar, CA, has resulted in significant traffic disruptions today. The incident, which occurred around 9:24 PM, involved two vehicles: a dark-colored SUV and a light-colored vehicle. Both vehicles are currently not drivable and are positioned partially on an embankment, necessitating towing services.

Emergency response units are on-site managing the situation, leading to lane closures that are causing slow-moving traffic and backups in the area. Motorists traveling on State Route 57 South are advised to expect delays and consider alternative routes to avoid congestion, particularly during the evening hours when traffic is typically heavier.

As emergency personnel work to clear the scene and facilitate the removal of the vehicles involved, the California Highway Patrol is actively controlling traffic flow to ensure safety. The response efforts may lead to extended delays, so drivers are encouraged to exercise patience while navigating through the affected area.

This traffic incident underscores the importance of remaining vigilant and cautious while driving, especially in areas impacted by collisions. Updates will be provided as the situation evolves, particularly regarding the reopening of lanes and the clearing of vehicles.

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