Major Collision Causes Traffic Chaos in San Marcos

Traffic Collision on State Route 78 East in San Marcos Causes Major Delays Today

📍 San Marcos, CA

📅 Published: September 15, 2025 at 02:40 PM

Map showing the location of the accident in San Marcos, CA
San Marcos, September 15, 2025 -

A significant traffic collision occurred today on State Route 78 East at Las Posas in San Marcos, CA, severely impacting traffic flow during the afternoon commute. The incident involved two vehicles: a white Toyota and a red SUV, both of which sustained considerable damage.

Emergency services, including the California Highway Patrol and towing units, were dispatched to the scene to manage traffic and facilitate the recovery of the vehicles. The collision resulted in multiple lane blockages, leading to extensive traffic delays and congestion in the area. Motorists reported slow-moving traffic, with some experiencing backups that reduced speeds to a crawl.

Towing assistance was called to remove the damaged vehicles from the roadway, and crews worked quickly to clear debris to restore normal traffic conditions. The situation required a temporary closure of affected lanes, which further contributed to the traffic backup.

Drivers are advised to seek alternate routes to avoid the area until the scene is fully cleared. The California Highway Patrol is actively managing the situation to ensure safety and expedite the reopening of lanes. As the afternoon progresses, motorists are encouraged to remain patient and vigilant while navigating through the congested roadways.

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