I would assume they have to have it programmed in them to pull over. They already need to incase of ambulance or fire trucks behind them. That's a day one fea

I would assume they have to have it programmed in them to pull over. They already need to incase of ambulance or fire trucks behind them. That's a day one feature. You see emergency flashing lights you pull over until they pass you. If they pull over behind you, then that's just a case of lights behind you, pull over and the car remains stopped. Flashing lights to signal to pull over is one of the most unbreakable of all driving rules, you can't release a self driving car that can't handle that case.