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Many cities now have rentable e-scooters available. I suggest any discussion should include these. To solve the need for a smartphone app problem the city could include rental in a smart card (eg. Oyster) system. Most major world cities I visit have a smart card for transportation. (but that's another issue). Further details on pluses and minuses of e-scooters: https://www.youtube.com/watch?v=bHrzEfJdu5Y