One comment on that site explains: "Truck Tracker uses smartphone GPS to update location. Tweets about location status set up in advance or sent on the fly. Map Widget enables trucks to include a map of their location on their website, mobile site & Facebook page. Opening location & closed updates work independently of Twitter."
There may be other solutions available. And Asheville might come up with its own GPS tracking system to ID where your favorite food truck is when you're looking for it!
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