Major Traffic Disruption on I-580 After Collision

Traffic Collision on Interstate 580 in San Quentin Causes Delays Today

📍 San Quentin, CA

📅 Published: July 28, 2025 at 12:06 PM

🔄 Updated: July 28, 2025 at 01:01 PM

Map showing the location of the accident in San Quentin, CA
San Quentin, July 28, 2025 -

A traffic collision involving two vehicles, a semi-truck and a white Ford, occurred today on Interstate 580 East near the San Quentin on-ramp in San Quentin, CA. The incident was reported at approximately 11:18 AM, leading to significant traffic disruptions during the morning commute.

Emergency responders arrived promptly to manage the situation, implementing traffic control measures. As a result of the collision, the left and lower lanes were blocked, leaving only the middle lane open for vehicles. This restriction caused noticeable delays and congestion as motorists navigated around the blocked lanes.

By 11:27 AM, a SigAlert was issued, warning drivers to expect delays due to the ongoing traffic incident. Multiple units were deployed to assist in managing the scene and ensuring safety for all road users. The blockage extended approximately one mile, contributing to increased traffic backup.

As responders worked to clear the scene, traffic began to gradually improve. By early afternoon, the situation was under control, and normal traffic flow was expected to resume soon. Motorists are advised to remain cautious and aware of potential residual delays as the area recovers from the incident.

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