Acknowledgements
U.S. Department of Transportation
Anthony Foxx
Secretary of Transportation
Victor Mendez
Deputy Secretary of Transportation
Gregory Winfree
Assistant Secretary for Research and Technology
Bureau of Transportation Statistics
Patricia Hu
Director
Rolf Schmitt
Deputy Director
Michael Sprung
Assistant Director for Transportation Analysis
Matthew Chambers
Project Manager
Editor
William Moore
Visual Information Specialist
Alpha Wingfield
Photo Credits
BTS Stock Photo
Alpha Wingfield
Stockvault
Lonnie Bradley
Rhonda Moore