'Road trains' called future of hands-free driving

Google may be grabbing headlines for its experiments with driverless cars, but fully robotic vehicles probably aren't the next step in our automotive future — think about how long it will take for governments to approve the technology and for auto companies to manufacture driverless cars en masse. Instead, we may soon see vehicle platoons (aka "road trains") that allow software-equipped cars to automatically follow a professional driver in a "lead car." It's a technology that could reduce congestion and increase both speed and fuel economy — and according to Volvo, it may be on European roads by 2020.

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