Is there such a system in general use? Aside from NY, and London with its archaic "knowlege", is there any artificial limitations on most cities? The problems

Is there such a system in general use? Aside from NY, and London with its archaic "knowlege", is there any artificial limitations on most cities? The problems with taxis has always been how inconvienent they are - hailing, having to pay, having to beg for a receipt (and then in NY the forced adverts) Uber etc makes taxis easy. It's cheap too, but that's to be expected in the near future with automated driving.