An injury crash involving at least four vehicles caused a major backup for anyone trying to drive from the North Bay into the city via 101 Tuesday morning.

The crash occurred just after 6:30 a.m. in the southbound lanes of Highway 101 just south of Seminary Drive in Mill Valley/Strawberry. A highway camera image from Caltrans showed a foggy scene and all of the southbound lanes blocked by debris.

The right-hand lane was able to reopen first, with all of the backed-up traffic then able to pass the scene in a single lane. CHP reported that all of the lanes had reopened by 7:35 a.m.

KCBS reported that at least four vehicles had been involved in the collision.

As Bay City News reports, an ambulance was called to the scene but information about any injuries has not been released.

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