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Like it or not, autonomous vehicles are on the way, and much is being done to study their integration into the world's transportation networks. As part of its own development of driver assistance systems, General Motors has begun to look driver behavior behind the wheels of self-driving vehicles; innovations like Cadillac semi-autonomous Super Cruise are designed to "ease the driver's workload" on the highway, but it will be good to know what drivers plan on doing to occupy their time.

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Cadillac has already been releasing a steady drip of information about what's going into its 2013 XTS like its autonomous-vehicle tech, and now it's focusing on lighting choreography. Cadillac reminds us that its lighting signature is vertical bands of illumination, tying it back to 1948, when the tailfins for which the brand is still known were first used on cars like the Fleetwood Sixty Special and Series 61 Coupe.

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Five years ago, GM engineers, a variety of partner companies, and Carnegie Mellon University built a Chevrolet Tahoe that autonomously traversed 60 miles of urban traffic in less than six hours, taking home the DARPA Urban Challenge win. Later this year, some of that technology will make its way to production in the 2013 Cadillac XTS.