This is interesting and closely related to the question how we tag, on two-way roads, continuous middle lines (or double continuous middle lines) that imply continuous stretches of road with "no-u-turn", no passing/overtaking, and "no-left-turn" (in countries with right-hand traffic). In addition there seems to be countries (I am not sure) where u-turns are generally forbidden on certain classes of roads. Why do we not use u_turn=no on highways, similar to the overtaking tag? I am also wondering why "overtaking" in reality is not frequently use either, worldwide only 40,000 tags.
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