Transportation planning models: what the papers say

Abstract

Papers on transportation planning models are reviewed, and observations and statements made by academics and practitioners about transportation planning models are presented here. The review focuses on U.K. practice and references are made to the conventional four-stage modelling process. Academics and researchers regard the four-stage models as discredited. However, practitioners among local authorities and consultants often use these models. This paper examines reservations about their use. It reviews the following aspects of the modelling process: accuracy; structural deficiencies or specification errors of models; and the purpose of modelling exercises. Data collection, zoning and networks, trip generation, distribution models, modal split, assignment, calibration and validation, and forecasting ability are discussed. The purpose of modelling, and special concerns of developing countries are also discussed.

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