That's relatively easy for a robot, though. It only has to learn the rules once.

What's hard for a robot is dealing with crazy unpredictable people, and while Boston has its share of those, I think SF is worse.

I don't know. Boston and New York may have a culture of taking whatever right of way you think you can get away with. The West Coast historically at least was more known for enforcing jaywalking though given the current state of SF I'm not sure that's still true. Boston/Cambridge also has a huge influx of students every year, many of which are pretty clueless about navigating an urban environment safely.

If you think careless/bold Harvard students are road hazards, wait until you meet the psychotic addicts of the Tenderloin.

I admit I probably know to not drive through SF on certain routes.