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In Structural Analysis of Discrete Data with Econometric Applications (eds Manski & McFadden). MIT Press, Cambridge, MA, USA. G. (1952) Some theoretical aspects of road traffic research. Proceedings of the Institution of Civil Engineers, 1(36), 325–362. 1 Introduction Once a transportation plan has been finalised and the demand along each of its highway links has been established, a process must be put in place that helps identify the best solution for each individual proposal within the highway network.

In order to develop a model for route choice, the following assumptions must be made: Forecasting Future Traffic Flows (1) (2) 35 Trip makers choose a route connecting their origin and destination on the basis of which one gives the shortest travel time Trip makers know the travel times on all available routes between the origin and destination. If these two assumptions are made, a rule of route choice can be assembled which states that trip makers will select a route that minimises their travel time between origin and destination.

The aim of the highway appraisal process is therefore to determine the economic, societal and environmental feasibility of the project or group of projects under examination. The process enables highway planners to decide whether a project is desirable in absolute terms and also provides a means of choosing between different competing project options, all of which have the ability to meet the stated goals and objectives of the project sponsors. The ‘reasoned choice’ model of individual or group decisions provides a decision-making framework within which scheme appraisal can take place, providing a technical foundation for non-recurring decisions such as the assessment of a highway construction/improvement proposal (Zey, 1992).

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