When a vehicle is in motion, you really shouldn’t leave it. Yes, there might be a rare case where you need to bail, but in general bailing out of the car is not the most ideal situation. Just ask the unidentified man in Colorado who dropped a lit cigarette down his shirt, jumped from his van, then ran over his own head with the van. Yes, he managed to run over his own head.
Luckily, the man is expected to live.