JACKSON, Tenn.- Police say they are trying to determine exactly what caused a car and semi to collide in east Jackson, Wednesday evening. The vehicles wrecked just before 6:30 p.m. at the intersection of the Highway 70 Bypass and Whitehall Street. Rescue crews worked for about half an hour to free the driver from the car. Investigators said he was taken by ambulance with what are believed to be non life-threatening injuries.