You have a hectic business trip to Seattle coming up and its time to choose hotels. Sure, there's cost, availability, checkout times ad whether it has a pool or gym to consider. But there's another important factor: proximity. The Travel Time API demo uses Seattle. See graphic below. You have 4 meetings scheduled over a couple of days: At Amazon's headquarters, a drop in at Starbucks for a chat with a friend, meet at the headquarters of Walkscore, and then lastly at Zillow.