I became hyper focused when learning to drive 29 years ago, after a friend was killed in an car accident . I consider myself a better driver then most and even drove tractor trailer for a few years. Unusual for most ADHD. Any accidents I have had were minor but definitely related to my ADHD, when I became complacent and inattentive. Maybe his little accident will just wake him up to how easily things happen. Note I scare people when their with me in a car but alone there is not problem. Don’t allow riders maybe the best policy.