Transportation on the fly is central to city life. Urban dwellers are always on the move--and taxis, buses and subway trains can't come fast enough. So a number of start-ups are leveraging smart-phone technology to inject more efficiency and speed into the process of getting around town when you don't own a car.
At the head of the pack is San Francisco--based Uber, which allows users to order so-called black cars--high-end sedans, limousines and SUVs--from their smart phones. The app for Apple's iPhone and Google's Android devices displays the wait time and shows the car's progress on a GPS-enabled map.
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