If autonomous cars become significantly safer in terms of the number of accidents, you could make a strong argument for lighter and lower-density of structural

If autonomous cars become significantly safer in terms of the number of accidents, you could make a strong argument for lighter and lower-density of structural materials, less passenger safety features, just significantly simpler cars. Of course that would depend on getting all the cars on the road to be self-driving - you don't want your crashless 500 pound Google car getting smashed by a behemoth human-driven Smart Car. But if you significantly reduced the materials cost in the car, that opens a big margin for Google to trade in.