Use the pencil to draw any road. (Make sure one end touches the green car.) Press space to start the self-driving car, and see if it can follow the road! This car will get itself unstuck.
Watch a real line-following robot here: https://www.youtube.com/watch?v=Cf-V-giXiRw And learn more about self-driving cars: https://www.youtube.com/watch?v=TsaES--OTzM