This didn't answer how a system would be fully developed without ever setting foot on a real road, with real obstacles, real weather, and real drivers.
Furthermore, if we were to follow this plan, would everyone in a participating nation receive a new car when the changeover occurs? In the US there are something like 250 million registered vehicles which would need to be replaced at the same time in order to be equipped with this new technology needed to work in unison with every other vehicle on the road. Frankly this is an unworkable solution IMO.