Police Lt. Lyn Tomioka said officers were called to the area of 21st Avenue and Clement Street at about 4:45 p.m. in response to multiple reports of an unconscious mail carrier.
Tomioka said that after the man fell out of the truck, the driverless vehicle traveled about half a block.
Albert Levy, owner of Aladdin Rugs on the corner of Clement and 21st, said the truck rolled down the wrong side of the street and crashed into a minivan.
Levy said he did not know the mail carrier. "He was not our regular mailman," he said.