FIL is 74 and getting on a bit. He can't walk far and relies on the car to get about. But we don't think he's safe on the roads anymore - his driving has scared us for some time and his reactions have got noticably slow over recent years. MIL can also drive but doesn't like motorway driving - she does a fair bit of daily driving I think.
We insist they visit us by train (they have free passes), but they still make 1-2 hour journeys, inc on the motorway.
DH, BIL and MIL have all talked to him about not driving anymore but the general opinion is that "you'll only seperate him from his keys by taking them from his cold dead hand". I just worry that could be in a multi-casualty pile up.
There aren't any obvious medical reasons for him to stop driving, any suggestions on what to do?