Laws of many countries and states forbid a driver from charging passengers for a ride, unless the driver has a commercial driver's license, and the vehicle is provided with a commercial license plate. Those laws primarily aim at enhancing safety, but may also be used to limit the number of taxis in a city to reduce traffic congestion. Is there a way to allow regular drivers to take paid passengers on their regular commutes, without creating an incentive for non-commercial licensed drivers to drive primarily for revenue generation? Some ways carpooling apps could help prevent creating such incentive: setting a limit on how much a driver can charge, what routes he/she can take with paid passengers, and the number of rides he/she can make.
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