Transcription of Chapter 14 Trip Distribution - ICPSR
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Chapter 14 Trip Distribution - ICPSR
14 Trip DistributionIn this Chapter , the mechanics of the second crime travel demand modeling stage -trip Distribution - is explained. Trip Distribution is a model of the number of trips thatoccur between each origin zone and each destination zone. It uses the predicted number oftrips originating in each origin zone (trip production model) and the predicted number oftrips ending in each destination zone (trip attraction model). Thus, trip Distribution is amodel of travel between zones - trips or links. The modeled trip Distribution can then becompared to the actual Distribution to see whether the model produces a BackgroundThe theoretical background behind the trip Distribution module is presented first. Next, the specific procedures and tests are discussed with the model being illustrated withdata from Baltimore of the ModelTrip Distribution usually occurs through an allocation model that splits trips fromeach origin zone into distinct destinations. That is, there is a matrix which relates thenumber of trips originating in each zone to the number of trips ending in each zone.
For example, with the Baltimore Coun ty data that are being us ed to illustrate the model, there are 325 dest inations zones for Baltimore Coun ty while th e origin zones include both the 325 in Baltimore County and 207 more from the adjacent City of Baltimore. As chapter 12 pointed out, the study area should extend beyond the modeling
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