Quote: "In that way, you'd either have to do a total conversion, costing crazy amounts of money to convert all vehicles to driverless. In the process, changing road systems so that placemarkers denote the paths the driving AI should take, as well as an infrastructure for the cars to communicate and organise routes."
The cars currently use GPS, cameras, and various other sensors to determine their routes, the speed limits, stop signs, lights, potential dangers, and everything else needed to drive, so no changes would be necessary.