Major Collision Disrupts Traffic on I-405

Traffic Collision on Interstate 405 in Signal Hill Causes Significant Delays Today

📍 Signal Hill, CA

📅 Published: May 8, 2025 at 11:34 PM

🔄 Updated: May 9, 2025 at 03:00 AM

Map showing the location of the accident in Signal Hill, CA
Signal Hill, May 8, 2025 -

A significant traffic collision occurred today on the southbound lanes of Interstate 405 (I-405) near the Atlantic Avenue on-ramp in Signal Hill, CA. The incident involved four vehicles, including a semi-truck, a box truck, and two unknown sedans. The collision resulted in the blockage of multiple lanes, causing considerable traffic delays and congestion during the evening commute.

Emergency services promptly responded to the scene to manage traffic flow and ensure safety. Tow operators were called to assist with the removal of the vehicles, including an evidence tow. Debris from the collision was present on the roadway, which initially complicated traffic conditions. However, as the situation was addressed, all lanes were eventually reopened to traffic.

The traffic incident led to significant backups, particularly affecting drivers heading home during peak hours. Authorities issued a signal alert to inform motorists of the ongoing situation and potential delays. By early morning, all lanes were confirmed clear, allowing for the resumption of normal traffic patterns.

Motorists are advised to remain cautious in the area as residual congestion may persist following the incident. The California Highway Patrol continues to monitor the situation to ensure safe travel for all drivers.

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