Traffic backs up Tuesday April 14, 2015 on Interstate 37 southbound at Loop 410 after a one vehicle rollover accident took place shortly after 10:00 a.m.. A San Antonio police officer at the scene said a tire on the Chevy Blazer (right) blew out causing the vehicle to roll. One person in the vehicle was transported by E.M.S. to an area hospital who complained of back pain.