Incoming car buzzer on your phone

The prob­lem — elec­tric cars are qui­et and are there­fore more dan­ger­ous to pedes­tri­ans. The/A solu­tion — a phone app which buzzes as they get clos­er. Could pote­tial­ly use 4G sig­nals emit­ted from the dri­vers phone (and detect that it’s mov­ing towards you at speed using doppler) or have every car fit­ted with a spe­cial pedes­tri­an broadcaster.

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