Car hailing app Uber offers a new kind of customer convenience that hits you on the first try. Now it's often better to tap at your device than do the driving yourself or call a taxi. No need to step outside until a driver you superficially already know has arrived.

Uber and the like are winning over consumers and, more slowly, gaining the endorsement of employers. Corporate travel managers across the United States said they're noticing an increasing number of charges for Uber in expense reports, and loads of them now are working with risk and legal departments . . .

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