U.S. Department of Transportation
Anthony Foxx
Secretary of Transportation

Victor Mendez
Deputy Secretary of Transportation

Sophie Shulman
Acting Assistant Secretary for Research and Technology

Bureau of Transportation Statistics
Patricia Hu
Director

Rolf Schmitt, Ph.D.
Deputy Director

Produced under the direction of:
Michael J. Sprung
Director, Office of Transportation Analysis

Project Manager
Matthew Chambers

Major Contributors
Volpe National Transportation Systems Center
Anne Aylward, Director
Alisa Fine
Kevin Mulder
Lydia Rainville

Hackett Associates
Daniel Hackett

The Tioga Group, Inc.
Dan Smith

Other Contributors
Volpe National Transportation Systems Center
Tom Gill
Nathan B. Grace
Sara Secunda

Hackett Associates
David Hackett

U.S. Maritime Administration
Doug McDonald

U.S. Army Corps of Engineers
Marin Kress, Ph.D.
Kenneth Ned Mitchell, Ph.D.
Amy Tujague