The yellow/green cab experiment failed because it happened before the magic of smartphone ubiquity. The problem with yellow/green cabs was density -- the density outside Manhattan is thin and the area is enormous. The chances of a yellow/green taxi just passing by when you need one is close to zero.
Uber/Lyft solved this issue with beaconing. Uber/Lyft further reduce cost if you pool, which is great all around.
Uber/Lyft solved this issue with beaconing. Uber/Lyft further reduce cost if you pool, which is great all around.