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The Department of Transportation in the united States also employes SDT in evaluating intersection and locomotive grade crossing accidents, prevention, and safety. Because the number of accidents that drivers DO NOT get in to when they cross intersections, the expectation of having an accident is low, the frequency of accidents is low and the risk is low. It would be informative if the article was updated reflect some more real-world applications of SDT being applied within the transportation infrastructure. Fredric Rice (talk) 00:37, 21 February 2009 (UTC)