Traffic advisory, I-15, Fontana 6:35 a.m.
Two cars collided on the southbound 15 south of Sierra Avenue, causing one vehicle to flip onto its roof. The overturned vehicle is by the center divider and the other is along the right shoulder. There are no injuries. The crash has caused traffic congestion. Update: The traffic advisory was canceled at 7:30 a.m., but some residual backup remains.