An initial draft of the glossary was developed by John Mason for TRB's Regional Transportation Systems Management and Operations Committee. Louis G. Neudorff took the draft and guided it through an update, the review process, and final editing. The efforts of these authors and the reviewers are appreciated and acknowledged. This glossary should be viewed as a starting point and not as a final product. It is hoped that it will be a living document with periodic reviews and updates to stay abreast of the changes in the management and operations of our transportation systems.
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