I wonder if in the future the law will say self driving cars can ignore all those signs when the car chooses to. Obviously there will be a lot of legalese about it, but most signs can be safely ignored already if you understand all the hazards - this is why people tend to just slow down at stop signs not come to a complete stop.

This is better for the environment, there is a lot of energy lost in a full stop for a stop sign that could be saved: less air pollution/CO2 to deal with.