WEST COVINA, Calif. -- A semi-truck hauling a payload of beer veered over the side of a freeway on-ramp and overturned Thursday morning in West Covina, California, spilling hundreds of cans on a hillside and the street below.The single-vehicle collision, which ignited a small fire, was reported shortly before 6:30 a.m. at the westbound 10 Freeway and Grand Avenue, according to a California Highway Patrol incident log.The driver was able to exit the wrecked big rig and was walking unassisted.The cause of the crash was under investigation.One of the off-ramp's lanes was blocked as crews worked to remove the Modelo beer cans.