| http://www.w3.org/ns/prov#value | - It also can not guarantee the accuracy of ETAs, and tracking may pause if a messenger hops on the subway.Still, it marks a new direction for Uber and is the latest example of an essentially offline service being turned into an on-demand mobile app. Uber and its rivals, including Lyft and Sidecar, have already turned the taxi business on its head.Uber had apparently planned to announce the service
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