An overturned box truck is slowing traffic on Highway 37 at the Petaluma River Bridge on Monday afternoon, according to the California Highway Patrol.

The accident happened on the westbound side of the road. The truck is blocking the fast lane.

There is no estimated time of the road re-opening.

This is the reverse commute direction, but traffic is still slow on both sides.

Stay with KRON4 for updates on this breaking news story on-air, online, and on the KRON4 app.

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