A two-vehicle accident resulting in moderate injuries to one driver caused a large back-up on Highway 49 just after the lunch hour, according to law enforcement officials. At 12:50 p.m., an unidentified female driver, who was driving a white van northbound on Highway 49 near the Idaho-Maryland Road interchange, stopped suddenly to avoid hitting a dog on the highway, said Dina Hernandez of the California Highway Patrol. Bobby Leatherman, 32, of Grass Valley, was following the van in a pick-up truck and did not see it stop suddenly and slammed into the rear end of the vehicle, Hernandez. The female …