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If in a perfect world, self driving cars will eliminate crashes and save fuel. Vehicles will accelerate at the most fuel efficient rate, vehicles communicating with each other will form a train to reduce wind drag and increase fuel efficiency. On interstate highway travel, they can go as fast as the slowest vehicle can go safely. They can form trains of big rigs and trains of fast cars. The trains of rigs will stay right, trains of slower vehicles will stay right unless passing rigs, and fast vehicles passing all. Having no crashes means road surfaces last longer. Vehicles can send road surface info with GPS to the facility in charge of road repair.
That's in a perfect world situation. There's no such thing as a perfect world. These vehicles, by their nature, are open to hacking. Sick minded people will take control of people's vehicle to scare them for fun. Want to kill someone? Hack their vehicle and crash it. How reliable is the vehicle's GPS that they use for navigation? I want control.
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