Spoke with my AME on this subject at my last physical. He brought up some very good points against the 'drivers license medical'. Without going into all the details, the most apt point is that the AME puts eyeballs on the applicant and determines a fitness to fly or not...and that extends beyond the simple values of blood pressure, eye sight, color blindness, etc. Looking across the general populace, there are plenty of people who have valid drivers license, but lack the mental capacity/stability to pilot aircraft, for example. So at this point, I believe a drivers license medical is not a whole-sale alternative to a 3d class medical. -Jim