[AnthonyMouse]

> it is complex but also something every driver manages every time they get behind the wheel.

It's also something that humans are still better at judging than machines, because they have general intelligence. They can tell that a speed limit sign for a service road visible from the highway is not the speed limit for the highway. They can guess what a sign covered in rust or sludge might have said based on the road conditions or the speed of other traffic or personal knowledge of the area.

And when the machine gets it wrong more often, you don't want it to be overriding the human driver by force.