An app that has brought luxury car service to the masses is stirring a technology-driven battle between cabbies and hired drivers of those black sedans. With a few taps of the app Uber, users can summon a sedan without having to stand on the street and flag down a cab. It not a bargain -- Uber rides are about 50 percent more than a cab -- but the service is catching on in cities such as Boston and San Francisco.
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