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Acknowledgments

U.S. Department of Transportation

Norman Y. Mineta
Secretary

Maria Cino
Deputy Secretary

Research and Innovative Technology Administration

Ashok G. Kaveeshwar
Administrator

Eric C. Peterson
Deputy Administrator

Bureau of Transportation Statistics

Mary J. Hutzler
Acting Deputy Director

Produced under the direction of:

Wendell Fletcher
Assistant Director for Transportation Analysis

Project Manager

Kay Drucker

Contributors

Felix Ammah-Tagoe
David Chesser
Marsha Fenn
Lee Giesbrecht
Alpha Glass-Wingfield
Paulette Grady
Xiaoli Han
Shana Johnson
Jeffery Memmott
Getachew Mekonnen
Long Nguyen
Lorisa Smith
Michael Sprung
Jie Zhang