I gave up driving voluntarily because I didn't want to kill my wife or any other member of the public.
I live near a doctors surgery and accidents are frequent. This made me realise, you think your OK, but are you really?
Those who cause the accidents very rarely report them, porbably because they are not fit to drive, but refuse to give it up. If they report them, the insurance might question their ability. Hence we get asked frequently if we saw who did it. We never do. Our own cars have been damaged several times over the years.
When I asked my consultant he also advised giving up is the right thing to do. Even on the bottle of Madopar it says caution driving may be impaired.
Yes it is awkward at times, but so is running someones child or elderly relative over, because reactions are slower. I would not like to live with that on my conscience.