Tell me an idea for a film based off of the cartoon movie Cars but incorporate self-driving cars.
A self-driving car named Walter (voiced by Will Arnett) is stuck driving drunk passengers around San Francisco at all hours of the night trying to make ends meet. He frequently has pedestrians staring at him because he doesn't have a driver, kids drawing graffiti on him, and passengers giving him a bad review for being too cautious while driving.

Walter dreams of being a race car like the rich cars he sees on Tik Tok. They get to drive fast as Sonoma Raceway and race each other in front of stadiums full of people while Walter has to follow the 30mph speed limit on SF streets.

Walter finds out that the race car life isn't all it's cracked up to be, and realizes over time to be happy with what he has and that at least he isn't one of those ride-share vehicles that can't drive themselves around town.