[catboybotnet]

Yes, this is an issue self-driving cars. Roads and signage are not unchanging and always set up proper or the same way every time, everywhere, nor do they need to be.

Light control at an intersection out? They'll just blink red, indicating a stop sign. Maybe they're off, and they put up temporary stop signs on the corners, or as you mentioned, a police officer redirects traffic. And then a fire engine will run through it, as they need to.