I think some form of 'MoT test' for people should be mandatory like the MoT tests for their cars. Provide evidence of a current eyesight test when renewing insurance is one idea perhaps.
Driving conditions, and the testing regime, have changed hugely since I passed my test, my eyesight has deteriorated and my reflexes are not what the once were, my neck is no longer as flexible as it once was, yet I am still licensed by a test taken when I was younger than my son is now.
But then I'd scrap tax discs and insist on a system of new licence plates every year with a coloured border indicting renewal with enforcement via roadside cameras.
I'd scrap commerical motor insurance and slap an insurance levy on the fuel (too late for that probably with the advent of indirectly fossil fueled vehicles)
and I'd declare war on the motorist formally, rather in the way we've declared war on smokers. For the good of the nation and world. (I do own a car btw)