Two safety items that are needed in my opinion are a required kill switch on the throttle pedal in case of a stuck throttle, and a way for the car to be shut off remotely by the officials.

The kill switch gives a driver a chance of slowing down if the throttle sticks. The remote shut off does two things, it gives the officials a way to kill the engine if a driver is unconcious with his foot the floor and also gives the officials a way to stop a driver who will not heed a black flag.