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National Transportation Safety Board (NTSB) Chairman Christopher Hart opened his speech at Safety 2015 by thanking the American Society of Safety Engineers (ASSE) for supporting two important initiatives: changing the impaired driving limit from .08 to .05, and banning the use of personal electronic devices while driving.
With that out of the way, Hart launched into an explanation of transportation systems, which are interdependent and complex, continuously changing due to high-tech innovations and generally tightly coupled.
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