This paper, which will be published in the Special Issue on Transportation of the Proceedings of the IEEE, examines the components and interworkings of transport systems and indicates some directions for improving our analysis capability. Suggestions are made for designing more realistic models for determining demand for travel, one of the major weaknesses of current efforts, and for improving methods of measuring the performance of a system. Much remains to be done in terms of modification, amplification, and clarification before we will be in a position to embark on large-scale systems studies or projects.
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