there's slack period as taxis will be relatively inaccompanied. but in many cities where the bars close at the same time it is impossible. we hope to meet the afternoon peak. there will be a fair degree of empty taxis because of the distribution of demand. so whatever you do wherever you do it even at peak demand there's some emptiness in the taxis. but you want a regular peak time where the taxis are waiting for the customers not the other way around >> the conclusion is that san francisco has a shortage and we take that evidence from multiple sources. first of all, we see it on the street in that our diagrams don't fully capture. those bars there a taxi gets a customer is the time involved. this is one example of a large number that we did at different times of day on the thunders afternoon peak not friday. now, it's true most of the taxis got a customer in the time of two minutes. if you can get a customer in two minutes downtown and it's consistent across any time why would i drive out and preposition yourself in the suburbia's to get to a cal