This isn't true at all. I can't tell if you're being serious or incredibly sarcastic, though.
The reason presidents (and generally ex presidents, too) don't drive themselves is because the kind of driving to escape an assassination attempt is a higher level of driving and training than what the vast majority of people ever have. There's no law saying presidents are forbidden from driving.
In any case, I would be perfectly happy if they let him drive a CT and it caught fire. I'd do a little jib, and I wouldn't care who sees that.