In the 21st Century,the U.S.Transportation System will face serious challenges from:

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All of the above options are serious challenges that the U.S. Transportation System will face in the 21st Century. Inadequate infrastructure can lead to congestion, delays, and safety issues. Sustainability issues including reducing carbon emissions and using environmentally friendly transportation options are becoming increasingly important. Finally, fluctuating energy costs can have a significant impact on the affordability and accessibility of transportation for individuals and businesses.