Origin destination surveys

Abstract

A variety of survey techniques (the most popular of which is the number plate survey) are used to estimate the origins and destinations of traffic movements, for data on trip patterns (trip distribution) are essential in situations where diversion of traffic may result from a new traffic management scheme. Such cases include the provision of a new road facility (eg a bridge or bypass road); the development of a large traffic generator (eg a new regional shopping centre); a proposed restraint on trip movements (eg a street closure in a residential area; or pedestrianisation of a shopping street). Origin destination (od) surveys may be employed to provide a quantitative assessment of the amount of traffic likely to be affected by the proposal, and the consequent impacts on various elements in the road system. However, it should be noted that od surveys are liable to significant errors and biases. It is not sufficient to know about the data collection techniques without regard for the problems inherent in particular techniques. In addition, od surveys are also amongst the most labour intensive and costly of the common traffic survey methods. Care is needed in their employment so that these surveys do not waste scarce resources.

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