San Andreas, CA…From San Andreas CHP…”The roadway will be closed for at least the next hour. Use alternate routes. 5/9/18 1212. SR-12 is blocked and traffic is being diverted through Mokelumne Hill. 5/9/18 1200 . SR-12 west of SR-49 (west of San Andreas) is blocked by a traffic collision. Avoid the area. Update……This was a pickup and trailer vs a motorcyclist. CHP will have a full release later..