It also prevents the driver from sliding to the front of the vehicle.
A 5-point harness, also called antisubmarine belt, has an additional strap that runs down from the lap belt to the car’s floor.The 6-point harness has two antisubmarine belts, which help with proper load distribution across the body of the driver in case of a crash. Such races rely on high speed and are always subject to various accidents cause by driver error, collision, or mechanical failure. 4-point harnesses include two belt laps and one belt for each shoulder.