text: In the article it says "These smart-road systems worked surprisingly well; but they required massive upgrades to existing roads, something that was to expensive to be practical." People are not going to want to go on the interstate and there be construction twenty-four seven. If there was a new driverless car that came out every five to ten years then maybe there would be enough money saved up to start a new upgrade on the road for the new driverless cars. The places making these cars are having to make them for new starters and for experienced drivers because new drivers need more senors then experienced drivers do.