Just tell him he ' s a fucking idiot and you will never accept a lift from him and tell others not to also , until he acts more responsibly . You could also take it one step further and tip off the police this would obviously be a nasty surprise , but traffic cops like a nice easy to target to teach them lesson source in my country police are often tipped off about people that regularly drink drive and the police lie in wait and catch them in the act . What ' s more stupid is that actually the average person can often fix their own lights with a few simple tools you can just put in some new bulbs . So if you were feeling charitable and didn ' t want to go the aggressive route you could offer to help him fix them ?