Flow-Density Relationship for Discontinuous Flow on Urban Street Network

Abstract:

The flow-density model for discontinuous flow on urban street network under under-saturated condition was studied in this paper. According to the concept of two-fluid theory, vehicles in the traffic stream were divided into two classes: stopped (for traffic signal) and moving. The amount of stopped and moving vehicles was estimated by applying fixed number theory and traffic flow theory. Then the model described flow-density relationship was derived on the basis of the concept of space-mean density. After that, impacts of the parameters in the model on the flow-density relationship are analyzed. Finally, twelve simulated conditions were designed and five critical flow was chosen to test the estimated accuracy of the model. Results show that the maximum and average absolute value of relative deviations between exact density and the estimated one was 10.07% and 6.39% respectively.

• Periodical: Applied Mechanics and Materials (Volumes 505-506)
• Pages: 999-1004
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.505-506.999
• Online since: January 2014
• Authors: Fu Jian Wang*, Wei Wei, Dong Fang Ma, Dian Hai Wang
• Keywords: Discontinuous Flow, Flow-Density Model, Single Lane, Urban Street

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