Proper auto cars.
In fact, my idea is better than that. The roads would essentially become a rail type link. You’d drive to the end of your street and then when you join the main carriageway, the master computer takes over your car, you’ve already told it where you’re going. Once you reach another car, you form a type of chain, nose to tail. Cars can be removed and added at the appropriate places but ultimately, you just sit there reading a book or more likely, watching some bilge on TV while the master computer gets you all to your place of work.
From the day the system is activated there will be no road deaths. Cyberdyne systems 101 drive with a perfect record.
On August 22nd, 2024, Cyberdyne system 101 becomes self aware and drives everyone into the sea.