>> My comparison is driving in the US is mostly stateless and context free.
Understanding speeds, perhaps, but driving? There are many things that require context and state like the rightmost lane becoming an exit lane requiring action to continue straight ahead. You have left turns from right lanes in some states. There are different U-turn laws in adjacent states. Stop signs permitting right turns without stops in some states through tiny exception text.
GP's comment makes more sense if you consider driving safely/legally and actually navigating to be separate problems. in general, this is a good way to look at it; misunderstanding right-of-way is much more serious than taking a wrong (but legal) turn.
there are some cases where there is an implied state/town speed limit, but other than that, all the information you need to drive safely/legally is on signage in front of you or a hundred feet back.
Understanding speeds, perhaps, but driving? There are many things that require context and state like the rightmost lane becoming an exit lane requiring action to continue straight ahead. You have left turns from right lanes in some states. There are different U-turn laws in adjacent states. Stop signs permitting right turns without stops in some states through tiny exception text.