Acknowledgments
U.S. Department of Transportation
Anthony Foxx
	Secretary
Victor Mendez
	Deputy Secretary
Gregory Winfree
	Assistant Secretary for Research and Technology
Bureau of Transportation Statistics
Patricia Hu
	Director
Rolf Schmitt
	Deputy Director
Produced under the direction of:
Michael Sprung
	Assistant Director for Transportation Analysis
Mindy Liu
	Project Manager
William Moore
	Editor
Alpha Wingfield
	Visual Information Specialist
Contributors:
Steve Beningo
	Sean Jahanmir
	Long Nguyen