A small box truck rolled over Tuesday morning forcing California Highway Patrol officers to close one lane of eastbound Highway 37 in Novato.
According to a sig alert, the closure, which initially applied to both lanes, is south of Harbor Drive in Marin County. Officers are using the road's shoulder to allow cars to pass.
The closure will be in place for a while to allow crews to clear the debris, officers said. Commuters can expect delays and are requested to use alternate routes if possible.
Further details were not immediately available.