Traffic assignment by trip type using volume restraint and link restraint for application in small urban areas |
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| Authors: | David Scot Leftwich Clinton L. Heimbach |
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| Affiliation: | 1. David Scot Leftwich is Assistant Professor of Engineering, University of Central Florida, Orlando.;2. Clinton L. Heimbach is Professor of Civil Engineering, North Carolina State University, Raleigh. |
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| Abstract: | This research involved the development of a new traffic assignment model consisting of a set of procedures for an urbanized area with a population of 172,000. Historical, social, and economic data were used as input to conventional trip generation and trip distribution models to produce a trip table for network assignment. This fixed table was divided into three trip types: external-external trips, external-internal trips, and internal-internal trips. The methodology used to develop the new traffic assignment model assigned each of the trip types by varying the diversion of trips from the minimum path. External-external trips were assigned on a minimum path routing and external-internal trips were assigned with a slight diversion from the minimum path. Internal-internal trips were assigned with more diversion than external-internal trips and adjusted by utilizing iterative volume restraint and incremental link restraint. A statistical analysis indicated that assigning trips by trip types using trip diversion and volume and link restraint produces a significant improvement in the accuracy of the assigned traffic volumes. |
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