text: These self drivng cars will also be safer for others on the road reducing the chances of a crash. Car companies have taken extreme precautions with these machines fitting them with senors all over the cars. Google has taken the idea into its own hands with some companies like Toyota. They've modified a Toyota Prius and have outfitted it with a postiton-estimating sensor on the left rear wheel, a rotating sensor on the roof, a video camera mounted ner the review mirror, four automotive radar sensors, a GPS reciever, and an inertial motion sensor. These sensors will apply brakes and reduce power from the engine so that the driver at hand can take over.