text: Even though most cars aren't completely driverless, many improvements and innovations allow the driverless cars to evolve and become more intriguing. For example, BMW developed the "Traffic Jam Assistant." This car could handle driving functions at speeds up to 25 mph. This car also had special touch sensors to ensure the driver holds onto the wheel. Having cars that aren't fully driverless allows the driver to remain alert, so they can take over when there is a situation. This is a great thing about these cars. There are driver seats that vibrate when the car is in danger of backing into something. The Google car announces when the driver should take over. Other cars might have flashing lights or other signals that warn the driver to take control of the vehicle.