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Acknowledgments

U.S. Department of Transportation

Ray LaHood
Secretary

John Porcari
Deputy Secretary

Research and Innovative Technology Administration

Gregory Winfree
Deputy Administrator

Bureau of Transportation Statistics

Patricia Hu
Director

Rolf Schmitt
Deputy Director

Produced under the direction of:

Michael Sprung
Assistant Director for Transportation Analysis

Sean Jahanmir
Project Manager

Contributors

Mindy Liu
William Moore
Long Nguyen

Ken Notis
Alpha Wingfield