The papers contained in this volume were among those presented at the 79th Annual Meeting of the Transportation Research Board in January 2000. Nearly 1,600 papers were submitted by authors; more than 1,000 were presented at the meeting; and approximately 600 were accepted for publication in the 2000 Transportation Research Record series. The published papers will also be issued on CD-ROM, which will be available for purchase in late 2000. It should be noted that the preprint CD-ROM distributed at the 2000 meeting contains unedited, draft versions of presented papers, whereas the papers published in the 2000 Records include author revisions made in response to review comments. Starting with the 1999 volumes, the title of the Record series has included “Journal of the Transportation Research Board” to reflect more accurately the nature of this publication series and the peer-review process conducted in the acceptance of papers for publication. Each paper published in this volume was peer reviewed by the sponsoring committee acknowledged at the end of the text; members of the sponsoring committees for the papers in this volume are identified on page ii. Additional information about the Transportation Research Record series and the peer-review process can be found on the inside front cover. The Transportation Research Board appreciates the interest shown by authors in offering their papers and looks forward to future submissions. (Author/publisher)
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