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I believe that it takes some personal interest on a subject to develop a smartphone application for that. I guess that’s what happened to Eric Lo, a young media designer from San Francisco, who likes to eat street tacos and was frustrated by not being able to track one easily, due to their pop-up nature.
Lo developed FoodCarts, a prototype iOS application that allows its user to find a food cart in and around San Francisco in real-time.

Read more: http://popupcity.net/2013/01/tracking-street-food-with-an-app/#ixzz2TPJIoknD