In the event that the train gets stuck in the "banked curve" (after weaving through the police cars), the rider is close to being inverted (espeically the one near the opening. Should one pass out from all the blood rushing to their head, the foot restraint is designed to keep you in the seat and not fall out.
I don't believe that the ride has ever operated at 100% since opening as was intended/marketed. The helicopter scene was much better with all of the fire and water effects, however the hard water marks left on the cars did not go over well.