text: The second reason is that they are just too exspensive. The cars will need to have special sensors to make them a hundred percent safe. This will be too costly and will take a toll in economic debt. The sensors will need to be placed in every road and this will be way too costly. The article sates this about sensors in roads: "These smart-road systems worked suprisingly well, but they required massive upgrades to existing roads, something that was simply too exspensive to be practical" (Driverless Cars Are Coming). This statement makes a lot of sense especially since the debt is burrying our economy today. Also the other option is to have smart cars with 3D mapping sensors, but these cars will be too costly for many of the Americans today so there will still be accidents occuring. So the real answer to this is that driverless cars are too exspensive.