General Motors launches Maven, a car-sharing service

General Motors Co. has launched a car-sharing service that lets users reserve and unlock vehicles with their smartphones. The service, called Maven, debuted Thursday in Ann Arbor, Mich., and will initially focus on serving students and faculty at the University of Michigan. GM vehicles are to be available at 21 spots throughout the city. Users can rent a car through a free smartphone app, which is also used to unlock the vehicle, GM said.
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