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Assuming that the basic pattern of traffic does not change, traffic planners may seek to update the old matrix rather than compile a new one from scratch. The most straightforward way of doing this is by the application of a uniform growth factor where all cells within the existing matrix are multiplied by the same value in order to generate an updated set of figures. 7) where T t¢ij = Trips from zone i to zone j in some future forecasted year t¢ T ijt = Trips from zone i to zone j in the present year under observation t Gtt¢ = Expected growth in trip volumes between year t and year t¢ One drawback of this approach lies in the assumption that all zones will grow at the same rate.

21). 22). 2 is used within the trip distribution process, the rows sum correctly whereas the columns do not. 3 Modal split Two modes of travel are available to all trip makers within the interchange matrix: bus and private car. In order to determine the proportion of trips undertaken by car, the utility of each mode must be estimated. 00 more than by bus The journey takes 10 minutes longer by bus than by car. 802 So just over 80% of all trips made will be by car. 23. 23 to the various links within the highway network shown in Fig.

Assignment requires the construction of a mathematical relationship linking travel time to traffic flow along the route in question. e. the conditions a trip maker would experience if no other vehicles were present to hinder travel speed. In this situation, travel time can be assumed to be independent of the volume of traffic using the route. ) A more complex parabolic speed/flow relationship involves travel time increasing more quickly as traffic flow reaches capacity. In this situation, travel time is volume dependent.

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