A very American article. To Europeans (and people in most other places) the answer is obvious that it comes from the street signs. The only open question is whe

A very American article. To Europeans (and people in most other places) the answer is obvious that it comes from the street signs. The only open question is where their designers got the idea from. I was rather bemused that the article takes a third of its length before getting to that point, and almost glances over the remaining question (apparently it comes from the subcommittee that designed the no parking and no stopping signs).