Major Collision Causes Traffic Chaos on I-405

Traffic Collision on Interstate 405 in Costa Mesa Causes Lane Blockages Today

📍 Costa Mesa, CA

📅 Published: June 20, 2025 at 12:05 PM

🔄 Updated: June 20, 2025 at 02:00 PM

Map showing the location of the accident in Costa Mesa, CA
Costa Mesa, June 20, 2025 -

A significant traffic collision occurred today on the northbound lanes of Interstate 405 (I-405) at the intersection with State Route 55 in Costa Mesa, CA. The incident involved five vehicles, including a gray Chevrolet Traverse, a gray Lexus SUV, a black Buick SUV, a black truck, and one additional vehicle with unspecified details.

The collision has resulted in lane blockages, particularly affecting the right lanes and lane number two, leading to considerable traffic congestion. Motorists are advised to expect delays and backups as emergency response teams work to manage the situation.

Traffic management units were deployed to the scene to assist with traffic flow and alleviate the impact of the collision. While some vehicles involved are reported to be driveable, their positioning continues to obstruct traffic, resulting in slow-moving conditions for drivers in the area.

The incident has created a challenging situation for commuters during the busy morning hours, with traffic expected to remain slow until the blockage is cleared. Travelers are encouraged to seek alternative routes if possible to avoid the affected area.

Updates will be provided as the situation develops and authorities work to resolve the traffic incident on I-405 in Costa Mesa, CA.

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