text: estimiating sensors on the left rear wheel, a rotating sensor on the roof, a video camera mounted near the rearview miror, four auto motive radar sensors, a GPS receiver, and an inertial motion sensor. The most important bit of technolopgy in this syster is the spinning sensor on the roof. Dubbed LIDAR." A regular car requires simple parts at times such as a spark plug or a new battery perhaps some oil. If every car was to be replaced by driverless cars, who would have to pay for replacement parts the owner or the manufactuer. I guarantee you none of those parts are remotely cheap. Currently out of the various models of driverless cars one with potential was started by engineers at Berkeley, but their model requires roads to be updated as well with magnets to alternate polarity. That would be alright but it would be an unpractical amount of money that taxes wouldn't help pay for much.