text: Also some manufacturers have been developing a smart road system with dual polarity magnets, the cars would read the polarities and would stay on the road. The issue with that is to create a smart road system would take to much time and effort to put together, which make it very impractical. Instead manufaturers turned to smarter cars instead. They desinged it to have sensors that would mimic the actions of a human, like monitering the road, video cameras mounted near the rearveiw mirror, and a inertial motion sensor. It all sounds very grand, elaborite, and very expensive.