Monitoring the performance of the transportation system and the impacts of individual actions is the key to an effective TSM planning process. This has been recognized by most TSM planners, and a wide range of monitoring processes have been established. An monitoring program should be designed to provide the information needed to make decisions about specific projects and also should rely, to the extent possible, on the existing capabilities of agencies within the metropolitan area. A large number of the TSM projects planned, designed, and implemented each year need not be the concern of a TSM monitoring program or of an MPO involvmeent. Aggregate information on system performance, however, which includes the summed impacts of all the individual projects, should be forwarded to the MPO. However, projects that are regionally significant should be monitored closely by both the MPO and the operating agencies, so that modifications can be made during initial implementation to improve service performance and evaluations can be conducted to determine the feasibility of this type of project in the metropolitan area. In summary, then, the TSM monitoring program for a metropolitan area should have the following characteristics: 1. Those TSM actions that have been the responsibility of operating agencies in the past and have no significant impact on the regional transportation system will be monitored only to the extent that the operating agencies need additional information to make decisions about future project implementation. 2. Regional projects and those that do not fall naturally under the purview of one agency will be monitored in a cooperative manner by the MPO and the relevant operating agencies. The evaluation of these projects will include MOEs that relate closely to the stated TSM goals and objectives and will thus serve as a basis of comparison between TSM projects. 3. System performance indicators, on a regionwide basis, will be used to monitor the performance of the transportation network and identify trends in travel behvior. This monitoring activity will be part of the on-going transportation planning process for the metropolitan area. Efforts to relate TSM program effectiveness with system performance must be carefully designed so that causal relationships can be clearly established. 4. When appropriate, corridor-based monitoring systems will be used in those corridors where TSM actions are being implemented. The results of this monitoring will be used by MPO staff to determine which TSM goals and objectives are being addressed. This implies that a standard set of measures will be used in all TSM evaluations in each metropolitan area. (Author)

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    • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. This paper appeared in Transportation Research Board Special Report No. 190: Transportation System Management in 1980.
  • Corporate Authors:

    Transportation Research Board (TRB)

    Washington, DC   
  • Authors:
    • Meyer, Michael D
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  • Publication Date: 1980

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  • Media Type: Digital/other
  • Features: References; Tables;
  • Pagination: pp 58-65
  • Monograph Title: Transportation system management in 1980: state of the art and future directions
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  • Accession Number: 00319373
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 30 1980 12:00AM