I read the USAC Sprint rules and there is no mention anywhere about restrictions on drivers getting out of their cars while on the track in green, yellow or red flags. Most rules around red and yellow are restrictions on what the crew can do and say nothing about the driver. I do not believe NASCAR has such a rule either. In fact, the drivers involved in accidents in NASCAR almost always get out of their cars on the track. Just a couple of years ago, a NASCAR driver got out of their car on a red and pulled a fender off his tire. He was penalized for working on the car, but not for getting out as I recall. Sprint car drivers almost always get out of their cars on yellows as oft times the damaged cars are carried off the track on a hook since they can no longer roll.
That said, it does seem racing needs to look at the rules under yellow when cars are circulating. If the car is not on fire, the driver needs to wait until the safety team has established a perimeter to exist the car.
You have responded as if I said something about the act of getting out of the car.
My statement concerned “running around on the track, fighting, etc.”
It is possible for a driver to get out of his car....bend a fender, assist the tow truck etc, without running around and looking for somebody to punch. NASCAR has a blanket rule for ‘Causing a safety violation’, and I believe they will start using it.
In some sanctioning bodies, this and other safety considerations might be a part of the discussion at the pre-race drivers meetings. I’ve attended drivers meetings with a couple of different sanctioning bodies, and staying in the car until safety workers arrive (unless fire) was specifically addressed by both clubs.