I don't have any idea what percentage of us drive, but I've been driving since 18, and I think HFA can actually lead to superior driving skills and safety. The lack of competitive urges and less aggression, and the desire to just follow the rules and not make waves, seems to apply here. Also, it seems to me that (speaking for myself and at least two other Aspies/with HFA), the physics and science part of driving is much easier. Case in point, I seem to be able to predict where a moving hazard ahead will be, when I get there... Such as airborne debris on the highway, or if someone has crashed in front of me, and is spinning out of control, I have (God willing) been able to "see" where the obstacle is going, and avoided it, whereas other drivers just jam the brakes on, or take other steps which sometimes can WORSEN the situation. I've personally seen many accidents in which one driver makes an unsafe sudden turn in front of oncoming traffic, and the oncoming traffic tried to panic-stop, while the left turner also panics and stops mid-turn... RIGHT IN FRONT of the oncoming car unable to stop. BANG! Using split-second thinking, and knowing the mass of both vehicles, I might elect to head straight for where the turning car is at the moment spotted, seeing by it's speed and mass that it will move an additional 9 or 10 feet before stopping. That way, I have passed behind it safely. Certainly no guarantees, but it has worked many times for me. When an airborne object is bouncing around on the highway ahead, I can see whether I need to aim left or right, based on the speed and distance. I see other people screwing up on that all the time, and hitting the object with almost perfect aim, in stead of evading it.
Just a few thoughts there...
Charles