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What are some transportation policies and regulations in the United States that address safety, security, and environmental challenges? How may these affect the cost, time, and ease with which products flow across the supply chain? How have these policies and regulations changed in the last 5 years?

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What are some transportation policies and regulations in the United States that address safety, security, and environmental challenges? How may these affect the cost, time, and ease with which products flow across the supply chain? How have these policies and regulations changed in the last 5 years?