Tesla's self-driving technology uses cameras and ultrasonic sensors to navigate and steer vehicles autonomously. The system is designed for full self-driving capabilities without action needed by the person in the driver's seat. Key functions include autosteer for navigation on more complex roads, smart summon to move the vehicle a short distance using a phone, and autonomous parking and summoning the car from its parked location. The advantages are autonomous lane changes, parking, and safety features as well as lower fuel costs, which make Teslas safer than other cars.