text: Driverless cars are also very safe to use. The cars can handle driving functions at speeds up to 25 mile per hour, but special touch sensors make sure the driver keeps hold of the wheel. Even though the word "driverless" may scare you, none of the cars developed so far are completely driverless. Which means you are still somewhat in control of the car. The cars may be able to steer, accelerate and brake themselves, but all are designed to notify the driver when the road ahead requires human skills, such as navigating through work zones and around accidents. The driver must stay alert and be ready to take over when the time comes. The car can quickly get the driver's attention whenever a problem occurs. GM has developed driver's seats that vibrate when the vehicle is in danger of backing into an object. Other options under consideration are flashing lights on the windshield and other heads-up displays. Basically, while the driver watches the road, the car watches the driver. (Paragraph 7)