00387657

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http://onlinepubs.trb.org...s/trr/1983/931/931-016.pdf

https://scholar.google.co...nsen&publication_year=1983

The level of spatial aggregation (i.e., zone size and network detail) used in transportation analyses is commonly regarded as an important factor affecting the accuracy of the resulting estimates. However, the precise effects of the level of network detail are largely unknown. To investigate these effects empirically for the car traffic assignment module, and experiment was designed to study both the separate and combined effects of the level of detail and the type of assignment model. It involves the application of various assignment models at different levels of detail. Network models at three levels of detail-fine, medium, and coarse-were developed for the road network of Eindhoven, Netherlands (population 200,000). The results of equilibrium and all-or-nothing assignments are presented. This presentation is mainly confined to the sensitivity of link load estimates. For further clarification, effects on shortest route prediction are also discussed. The level of detail had a significant effect on load and route predictions with both assignment models. This effect proved to be consistent but diminishing: an increase in the level of detail always yields better results, but only marginal improvements can be obtained beyond a certain level. Compared with all-or-nothing assignments, equilibrium loads agree much better with traffic counts at all levels of spatial detail. Recommendations are given as to what combinations of level of detail and assignment model type should be applied in practice. (Author)

Publication of this paper sponsored by Committee on Transportation Planning Needs and Requirements of Small and Medium-Sized Communities. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

00392261

pp 98-106

1983

Transportation Research Record

0309036216

Print

Figures (8) ; References (7) ; Tables (8)

Network links; Networks; Roads; Sensitivity; Size; Traffic assignment; Traffic counts

Equilibrium models; Links; Road networks

Highways; Planning and Forecasting; I72: Traffic and Transport Planning

TRIS, TRB

Sep 28 1984 12:00AM

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