However, auto deaths are significantly more common among younger people than older people, and members of Congress are definitely old…so in that sense MCs should be less likely than average to die in a car accident.
Members of Congress almost never drive themselves though, they usually have staffers do it when they're doing work-related stuff. And given that staffers are mostly on the younger end, I'm frankly surprised it doesn't happen more often.
I'm guessing that a lot of those deaths have to do with drunk driving, and I doubt as many staffers are driving drunk while on the clock. It's not purely an experience thing, but also one relating to certain behaviors that are less likely in that circumstance.