London's Heathrow airport is gearing up for the unveiling of what could be the answer to cities around the globe problem with traffic congestion and the accompanying environmental concerns. Once construction is completed on the airport's new terminal, a network of 18 driverless pods will ferry people between the car park and the terminal. While personal rapid transport (PRT) systems have been discussed for ages, Heathrow will be the first to publicly test the system.

The Guardian explains how PRT sets itself apart from other mass transit systems:

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