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Acknowledgments
U.S. Department of Transportation
Mary E. Peters
Secretary
Maria Cino
Deputy Secretary
Research and Innovative Technology Administratino
John Bobo
Administrator (Acting)
Bureau of Transportation Statistics
John O'Donnell
Director (Acting)
Produced under the direction of:
Wendell Fletcher
Assistant Director for
Transportation Analysis
Project Manager
Jennifer Brady
Contributors
Felix Ammah-Tagoe
David Chesser
Xiaoli Han
Getachew Mekonnen
William Moore
Lorisa Smith
Michael Sprung
Nicholas Wical
Alpha Glass-Wingfield
Jie Zhang
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