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"Collision avoidance systems aren't exactly exciting new news any more. But most of these systems, even the ones that jerk the wheel out of your hands, simply detect obstacles -- they don't talk to each other. GM's new prototype uses Dedicated Short-Range Communication (DSRC) to share data with other vehicles. The cars not only detect other motorists, but construction zones, police activity, and slowed or stopped traffic. Unlike a similar concept from Ford, GM doesn't just talk to cars in the immediate area, but can detect trouble up to a quarter mile down the road, offering plenty of warning time for you to change course or hit those breaks. We think the company's estimate that such a system could avoid 81-percent of crashes in the US is a tad optimistic though -- clearly they don't realize how big of jerks most drivers are."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2011/10/20/gm-demos-accident-avoidance-system-with-brains-and-long-range/?ncid=rss_semi>