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Impacts of number of O/D zone and Network aggregation level in Transportation Demand Forecast  

Lim, Yong-Taek (전남대학교 교통물류학부)
Kang, Min-Gu (전남대학교 교통물류학과)
Lee, Chang-Hun (전남대학교 교통물류학과)
Publication Information
Journal of Korean Society of Transportation / v.26, no.2, 2008 , pp. 147-156 More about this Journal
Abstract
It has been widely known that there are so many factors making travel demand errors in transportation forecasting steps. One of the reasons may stem from the level of aggregation of zone and network in analysis process. This paper investigates the effect of level of aggregation considering with number of zones in travel demand forecasting by expanding or reducing the zone and network gradually. Numerical results show that the aggregation could not make a significant impact on the travel demand, while disaggregation does. These results imply that a careful manipulation is required to add or to reduce zones and links in transportation planning process.
Keywords
Network aggregation; Level of O/D zone; RMSE; F-test; Travel demand error;
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