Acknowledgments

U.S. Department of Transportation

Ray LaHood
Secretary

John D. Porcari
Deputy Secretary

Research and Innovative Technology Administration

Gregory Winfree
Acting Administrator

Bureau of Transportation Statistics

Patricia Hu
Director

Deborah Johnson
Acting Deputy Director

Project Manager

Sean Jahanmir

Contributors

Steven Beningo
Chester Ford
Mindy Liu
William Moore
Ken Notis
Bernard Stankus
Anne Suissa
Alpha Wingfield