I compiled a list of problems observed with an older driver. Provided full contact information for myself and that other driver. Sent it in as directed by the safety folks at State. Letter arrived at the bad driver's house indicating evaluation by doctor required. Examination revealed unfit to drive. Letter revoking license arrived after bad driver's death from cancer. Took a while, was pretty easy, and really got the culprit pissed off! But the system worked. Check into your state's system. Usually there's a nice lady who answers the phone. She'll know more than the "right" people you're supposed to talk to!