On Sun, 20 Dec 2020 at 16:11, Peter Neale via Tagging < tagging@openstreetmap.org> wrote:
> I agree. To be called a "pillow", it would have to be soft and not rigid. > IIRC there are traffic calming "pillows" that are filled with air and > deflate, if you drive over them slowly, but remain inflated, if you drive > over at speed. I regret that I cannot find a reference to them at the > moment. > https://en.wikipedia.org/wiki/Speed_bump#Dynamic_speed_bumps Not what you were thinking of, but achieving the same end (the effect depends on the speed of the vehicle): https://www.matfoundrygroup.com/News%20and%20Blog/The_Future_of_Roads_Liquid_Speed_Bumps -- Paul
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