Major Traffic Disruption on U.S. Highway 101

Traffic Collision on U.S. Highway 101 in Petaluma Causes Delays Today

📍 Petaluma, CA

📅 Published: September 1, 2025 at 04:35 PM

🔄 Updated: September 1, 2025 at 06:02 PM

Map showing the location of the accident in Petaluma, CA
Petaluma, September 1, 2025 -

A traffic collision on the northbound lanes of U.S. Highway 101 in Petaluma, CA, caused significant traffic disruptions today. The incident occurred around 4:03 PM when one vehicle was involved in a collision, leading to the closure of the Penngrove on-ramp to southbound U.S. Highway 101.

Emergency response units quickly arrived on the scene to manage the situation and ensure safety. The closure of the on-ramp resulted in traffic delays and congestion for motorists during the busy afternoon commute.

Additionally, reports indicated that a grass fire started on the right-hand side of the highway due to the collision. Fire crews were dispatched to address the fire, further complicating the traffic situation.

By approximately 5:00 PM, emergency responders had cleared the area, allowing for the restoration of normal traffic flow. Motorists are advised to remain cautious in the vicinity, as residual delays may still be present.

This incident underscores the importance of safe driving practices and the potential consequences of traffic collisions on busy highways. Drivers are encouraged to stay alert and follow traffic regulations to prevent similar incidents in the future.

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