Traffic is backing up along Highway 99 in Sacramento due to a reported crash. Caltrans cameras show multiple lanes blocked and law enforcement at the scene on Highway 99 at 4th Avenue. California Highway Patrol traffic logs indicate the backup was caused by a crash that was reported at 5:45 a.m. on northbound Highway 99 before reaching Highway 50. KCRA 3 is working to confirm details on what caused the crash and if there were any injuries.