JOURNAL OF TRANSPORTATION AND STATISTICS Volume 3 Number 2 September 2000 ISSN 1094-8848 BUREAU OF TRANSPORTATION STATISTICS UNITED STATES DEPARTMENT OF TRANSPORTATION U.S. DEPARTMENT OF The Journal of Transportation and Statistics is TRANSPORTATION published by the Bureau of Transportation Statistics RODNEY E. SLATER U.S. Department of Transportation Secretary Room 3430 400 7th Street SW MORTIMER L. DOWNEY Washington, DC 20590 Deputy Secretary USA
[email protected] BUREAU OF TRANSPORTATION STATISTICS ASHISH K. SEN Director Subscription information RICHARD R. KOWALEWSKI To receive a complimentary subscription Deputy Director or a BTS Product Catalog: mail Product Orders SUSAN J. LAPHAM Bureau of Transportation Statistics Associate Director for Statistical U.S. Department of Transportation Programs and Services Room 3430 400 7th Street SW Washington, DC 20590 USA phone 202.366.DATA fax 202.366.3640 internet www.bts.gov Cover and text design Susan JZ Hoffmeyer Layout Gardner Smith of OmniDigital Bureau of Transportation Statistics Cover photo Image® copyright 2000 PhotoDisc, Inc. Our mission is to lead in developing transportation data and information of high quality and to advance their effective use in both public and private transportation decisionmaking. Our vision for the future: Data and information of high quality will support every significant transportation policy decision, thus advancing the quality of life and the economic well-being of all Americans. The Secretary of Transportation has determined that the publication of this periodical is necessary in the transaction of the public business required by law of this Department. ii JOURNAL OF TRANSPORTATION AND STATISTICS Volume 3 Number 2 September 2000 Contents Introduction to the Special Issue on the Statistical Analysis and Modeling of Automotive Emissions Timothy C.