You can probably fit a device on your car that will make it legal to drive on "safe" roads. Something that actively looks out to prevent crashes and doesn't let you drive over the speed limit, for example, but doesn't actually steer the car. Similar to how when new laws on exhaust emissions passed, you could just upgrade the exhaust system without buying a whole new car.
I was saying for a while now, that we could probably reduce 90% of accidents by mandating that every car is fitted with a device that almost every new car has as an option - an automatic breaking system, which stops the car in case of imminent collision, based on a forward facing radar. I imagine it would reduce accidents in cities to near zero, and outside of them by an order of magnitude.
