One lane of state Highway 4 east of the Bailey Road is blocked after a collision in Contra Costa County this morning, according to the California Highway Patrol.
Officers responded to a report of a collision involving a motorcycle on westbound Highway 4 shortly before 6:30 a.m., the CHP said.
A Sig-alert was issued at 6:40 a.m. when two lanes were initially closed, according to the CHP.
One lane was reopened around 6:45 a.m. and there is no estimated time of when the remaining lane will reopen, according to the CHP.
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