A big rig was engulfed in flames after a driver led police on a low-speed chase down a California freeway, with the truck reported stolen. Despite the driver only traveling at 15mph, police were forced to close the freeway to other vehicles for several miles of Interstate 5 freeway on Thursday. It is not yet clear how the chase began, but it is understood the big rig had been reported stolen. The very low-speed chase began in the early afternoon, around 12.45pm, on the Interstate 5 freeway leaving Kern County.