There absolutely are - there is a minimum age, in may states reexamination is triggered above an age threshold, you must pass a test that the developmentally di

There absolutely are - there is a minimum age, in may states reexamination is triggered above an age threshold, you must pass a test that the developmentally disabled may not be able to pass, and driving while tired is absolutely illegal. It ma be poorly enforced, but professional drivers have to maintain regularly audited logs showing that they are properly rested; trucking companies get fined for having employees driving for too many hours in a day.