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Provides a comprehensive, state-of-the-art review of the operation and control strategies of light rail transit systems (LRTS). Intended to serve as a basis for further research in the goal of developing an analytical tool for evaluating the operations of light rail at-grade within an urban signal system. Identifies the various at-grade crossing types that can exist for a LRTS, the operating characteristics of light rail vehicles, and the use of control devices at at-grade crossings. Summarizes both the priority strategies used by transit agencies and the methods of evaluation used to assess the impacts of LRTS.
As the engineering and planning communities continue their progress toward managed and integrated transportation systems, transit will play an increasing role. Fifteen United States cities have already selected and implemented light rail transit (LRT) as a rail transit alternative. As engineers plan and design new or expanded systems, it is essential at they have at their disposal the techniques and procedures necessary to make decisions for LRT placement, system design, and operations. This report, the fourth and final report for project 0-1278, combines and enhances the information contained in the three interim reports and contains a step-by step procedure for analyzing LRT at grade crossings and crossing impacts within signalized networks. Based on the proposed system features and location, transportation analysis identify crossing type and environment. They then select a model based on listed criteria, code and calibrate the model to existing conditions or values provided, and perform the analyses. The procedure includes checks for system failure. Finally, analysts assign user costs to the LRT impacts identified and qualified by the procedure, and select the optimum alternatives for LRT operation.