Originally Posted by MotoMike
Sprints and midgets, at least when I was driving, required arm restraints
As far as I remember arm restraints in cars that don't use window nets have been required by New Jersey State rules since at least 1979 when I started driving.
The NJ State Police have a Motor Vehicle Racing Control Unit that mandates and inspects safety rules at the tracks. There was always a trooper in the pits, when entering the track you would have to hold your arms in the air so that the inspector could see gloves and restraints, if you weren't wearing them they would not let you out.