A motorcycle and a vehicle collided Wednesday during the morning commute on Highway 101 in southern Petaluma, the CHP said.

An ambulance was responding. Initial reports indicated the motorcycle rider had been injured in the 6:45 a.m. crash and he was taken by ambulance to Santa Rosa Memorial Hospital.

The two collided on southbound Highway 101 near Kastania Road.

The motorcycle ended up in a ditch and the car stopped on the shoulder.

Traffic heading out of the county had slowed to a crawl, according to CHP reports. One lane was closed temporarily to allow the ambulance to load up the injured rider.