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Or people opting for public transport part of the distance. One thing these services make convenient is to use them to get to/from train stations and the like without worrying about parking etc., or being stuck without a ride on the other end.

Indeed, hasn't this already been studied? Lyft & Uber have increased traffic, not reduced it, because the cars are driven a significant amount of the time without any passenger.

Reducing demand for (street0 parking increases road space for moving cars.