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Re:When’s a pedestrian not a pedestrian? When it’s a decal by buro9 on Monday July 24, 2017 @10:00AM (#14838517)
Sound travels around corners.

It not only reflects very well but the way some low frequencies spread out is enough to allow certain vehicles to be heard before they are visible (solid concrete could obscure the view).

Re:When’s a pedestrian not a pedestrian? When it’s a decal by cesarb on Monday July 24, 2017 @11:08AM (#14839041)
Also, sound can give early warning of an approaching train, or of an emergency vehicle nearby, or of a truck in reverse.