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In page Uber:

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Drivers must meet requirements for age, health, car age and type, have a driver's license and a smartphone or tablet, and must pass a background check.[2] In many cities, vehicles used by Uber drivers must pass annual safety inspections and/or must have an Uber emblem posted in the passenger window. Some cities also require Uber drivers to have a business license.[6] A mechanism called "Real-Time ID Check" requires some drivers to occasionally take selfies when logging on to Uber.[7][8]