text: If there are going to be smart cars then there needs to be smart roads as well. "General Motors created a concept car that could run on a special test track. The track was embedded with an electrical cable that sent radio signals to a receiver on the front end of the car. Engineers at Berkeley tried something similar, but they used magnets with alternating polarity as messages in binary code. These smart-road systems worked surprisingly well, but they required massive upgrades to existing roads, something that was simply too expensive." This passage shows the reader that this smart-road system could work because it worked in the past. The only problem is that it is an expensive system. In the future money can be made to make this system a reality. Google modified a Toyota Prius with a sensor system. "The most important bit of technology in this system is the spinning sensor on the roof. Dubbed LIDAR, it uses laser beams to form a constantly updating 3-D model of the car's surroundings. The combination of all this input is necessary for the driverless car to mimic the skill of a human at the wheel." This shows the reader tha the car can have the skills of a human driver and that there is a way to make driverless smart cars. This same system can be used for future driverless cars.