On Wed, 9 Dec 2020 at 14:26, Brian M. Sperlongano <zelonew...@gmail.com> wrote:
> I have found examples of both falling rock[1] and fallen rocks[2] on > signage and it's not clear to me which is the more common. > The UK signage for this hazard doesn't have text. But the explanation of the signage in the Highway Code says it warns of "Falling or fallen rocks." See https://www.highwaycodeuk.co.uk/warning-signs-on-the-road.html and search for "falling". In that same document, just above the falling/fallen rocks sign is the aircraft sign which it says warns of "Low-flying aircraft or sudden aircraft noise". Low-flying aircraft will often cause a sudden aircraft noise, but a high-flying supersonic aircraft can generate a sonic boom (but these are rare and if they occur they are not likely to be predictable as they will usually be the result of an emergency). I'd suggest fallen_rock and low_flying_aircraft as tag values based upon the common case but have the proposal mention their secondary application. I think there may be other hazard warning signs in that document for you to consider. -- Paul
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