David Banks, Editor-in-Chief
Susan Lapham, Associate Editor
John V. Wells, Associate Editor
Deborah Moore, Managing Editor
Martha Courtney, Editor
Marsha Fenn, Project Manager
Lorisa Smith, Editorial Assistant
The views presented in the articles in this journal are those of the authors and not necessarily the views of the Bureau of Transportation Statistics. All material contained in this journal is in the public domain and may be used and reprinted without special permission; citation as to source is required.