I'm not sure that anyone actually reads the "flavor text" on most standard signs in the US, you mostly go by shape or whatever once you know the shapes, so I do

I'm not sure that anyone actually reads the "flavor text" on most standard signs in the US, you mostly go by shape or whatever once you know the shapes, so I doubt there's any real cognitive overhead associated with reading the signs. (By contrast, the lack of even units on European speed limit signs always makes me think they are route markers...)