Published in: نشریه بین المللی مهندسی حمل و نقل، دوره: 7، شماره: 3
COI code: JR_IJTE-7-3_002
Paper Language: English
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Authors An Alternative Approach to Centroids and Connectors Pattern: Random Intra-Zonal Travel TimeMahdi Bashirinia - PhD Candidate, Department of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
Amir Reza Mamdoohi - Associate Professor, Department of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
João Silva - Associate Professor, CERIS/Cesur, Institute Superior Téchnico, Universidade de Lisboa
Abstract:In traditional traffic assignment procedure, each traffic analysis zone is represented by one point in its geometric center which is connected to the network by several connectors. Results of studies show that different connector patterns would result up to 10% change in estimated volume and up to 20% change in total travel time. Also the different patterns of connectors can change the priority of network development projects. Because of numerous possible scenarios for connection patterns, finding the optimum pattern is very difficult. The main goal of this research is proposing a substitute approach and proper solution algorithms to increase the accuracy of traffic assignment results. In this approach, the travel time inside the zone is considered as a random variable and is used in traffic assignment process. At first, all possible candidate nodes in each zone are selected and then between each pair of these nodes in different zones, the shortest path is determined. After that, the share of each route is estimated using discrete choice models and then share of them from demand is calculated. The proposed approach is tested using a real-size network with two route choice models of Logit and Probit. The results show significant changes in total network indexes (15%) and the average error in estimating of links volumes, has been reduced by 20%. Although the calculation time may increase 10 times than before, the proposed approach leads the traffic assignment results more accurate and close to real observed links volume.
Keywords:Centroid, connector, Random Access Time, Probability Density Function of Intra-Zonal Travel Time, Logit and Probit Models
COI code: JR_IJTE-7-3_002
how to cite to this paper:If you want to refer to this article in your research, you can easily use the following in the resources and references section:
Bashirinia, Mahdi; Amir Reza Mamdoohi & João Silva, 2020, An Alternative Approach to Centroids and Connectors Pattern: Random Intra-Zonal Travel Time, International Journal of Transportation Engineering 7 (3), https://www.civilica.com/Paper-JR_IJTE-JR_IJTE-7-3_002.htmlInside the text, wherever referred to or an achievement of this article is mentioned, after mentioning the article, inside the parental, the following specifications are written.
First Time: (Bashirinia, Mahdi; Amir Reza Mamdoohi & João Silva, 2020)
Second and more: (Bashirinia; Mamdoohi & Silva, 2020)
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The University/Research Center Information:
Type: state university
Paper No.: 25732
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