Major Traffic Collision Halts I-5 Southbound Commute

Traffic Collision on Interstate 5 in Castaic Causes Major Delays Today

📍 Castaic, CA

📅 Published: September 10, 2025 at 08:33 AM

🔄 Updated: September 10, 2025 at 10:01 AM

Map showing the location of the accident in Castaic, CA
Castaic, September 10, 2025 -

A significant traffic collision occurred today on Interstate 5 Southbound at the lower crossover in Castaic, CA, leading to major lane blockages during the morning commute. The incident involved three vehicles: a yellow crane, a gray cab with a white trailer semi, and a big rig. As a result, lanes one and two were completely blocked, while lane four was obstructed by the crane, causing considerable traffic disruptions.

Emergency response teams promptly implemented traffic management measures, including the installation of warning signs and active scene control to assist drivers. A hard closure was established for lanes one and two, while lanes three and four remained open to help alleviate congestion. The California Highway Patrol issued a Sig Alert, indicating that the lane closures would remain in effect for approximately three hours, creating potential delays for motorists traveling southbound on Interstate 5.

Drivers are advised to expect significant backup and congestion in the area as emergency crews work to clear the scene. A tow truck was requested to assist with the removal of the vehicles involved in the collision. Motorists are encouraged to seek alternate routes to avoid delays and stay updated on traffic conditions.

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