Reliability of Traffic Marco Modelling Results at Micro Level (Case Study: Tehran Expressway Network)

Articles in Press

Document Type : Original Article

Authors

1 Department of Civil Engineering , University of Tehran

2 PhD in Transportation, University of Tehran and Head of Transportation Department in Atiyeh Saz Shagh

3 Department of Civil Engineering, Iran University of Science & Technology

Abstract

Rapid growth of population in metropolitan areas has led to an increase in transportation demand. Accordingly, development of transportation infrastructures is necessity in management of urban transportation networks. Economic analysis of multiple projects is a major step toward achieving this goal. In order to evaluate the effects of network development plans, especially for the expressways and their interchanges, macroscopic traffic modelling softwares are usually applied. These softwares are capable of anticipating the traffic flow distribution in large scale networks and have acceptable accuracy according to their mathematical modeling approach. Also known as static tools, these softwares encounter severe level of errors in forecasting the traffic situations in small scale areas where interactions between traffic flows exist. Hence, using these tools to evaluate the plans of expanding the expressway network may lead to select a project which would not generate the expected benefits if implemented. In this paper, a hybrid modelling approach based on macroscopic and microscopic paradigms is proposed to verify the results of static softwares. In order to assess the proposed method, a real case design for completing the interchanges of an intersection between two major expressways in Tehran is studied. It is shown that applying the hybrid scheme is a necessity to guarantee the success of projects due to the characteristics of static softwares.

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Main Subjects

Journal of Transportation Research

Articles in Press, Accepted Manuscript
Available Online from 16 June 2020

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