text: The companies that have tried to make smart cars say that smarter cars need smarter roads. For example GM created a concept car in the 1950's that could run on a special track. The track was embedded with an electrical cable that sent radio signals to a receiver on the front end of the car. Companies figured since they couldn't make the road smarter they would make the cars smarter. Manufacturers such as Google with the modified Toyota Prius uses lots of sensors, video cameras, radar sensors, a GPS receiver, and an inertial motion sensor. Also a Dubbed LIDAR is used to form a constantly updating 3-D model of the vehicles surroundings using laser beams.