Maybe, but cars are already pretty good about reading signs.

It’s the lack of signs that’s the problem. Self-driving cars are pretty good on a well marked and signed road: if that’s all it took, we’re there. It’s the ubiquity of exceptions and edge cases that’s the problem.

My car recently did a one month trial of self-driving and it was a lot of fun. Also eye-opening. It did work really well on well-marked roads. However it also made me notice just how poorly marked most are. For example, it was great about staying centered between lane lines. However most local roads don’t paint the edge lines, or even the center line is worn off on many roads. Then the car is confused. I can’t even imagine what the car would do if everything were covered with snow, which does happen a lot around here