Investigating Parameter Interactions with the Factorial Design Method: Webster's Optimal Cycle Length Model
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Date
2018
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Univ Osijek, Tech Fac
Access Rights
info:eu-repo/semantics/openAccess
Abstract
Accurate estimation of cycle length is an important factor in the performance of a signalized intersection. Cycle length is determined by employing some parameters such as arrival flow, number of phase, lost time etc., but each parameter has different effects on a cycle length model. If the effects of parameters and their interactions in the cycle length model are known, the performance of the model can be effectively increased. In this study, the sensitivity of optimal cycle length model proposed by Webster and its parameters were analysed with the factorial design method. The reason for selecting this model is that the model has still been used in signal timing practice and has lead many studies of researchers over 50 years. The evaluation of sensitivity analysis shows that while arrival flow as single parameter has a major effect on the optimal cycle length model, the remaining single parameters of the model (i.e., the number of phase in a cycle length, saturation flow and lost time) have secondary importance. Additionally, two parameter interactions of arrival flow-saturation flow have major effect on the model results. For three parameter interactions, the number of phase-arrival flow-saturation flow interaction has a slightly larger effect than the other three-parameter interactions. As a result, the factorial design method is an effective tool to determine the importance of the model parameters for researchers, and it can be employed to other traffic engineering applications.
Description
AKGUNGOR, ALI PAYIDAR/0000-0003-0669-5715
Keywords
arrival flow, factorial design method, optimal cycle length, sensitivity analysis, Webster model
Journal or Series
Tehnicki Vjesnik-Technical Gazette
WoS Q Value
Q4
Scopus Q Value
Q3
Volume
25
Issue
Citation
Akgüngör, Ali & Korkmaz, Ersin. (2018). Investigating Parameter Interactions with the Factorial Design Method: Webster’s Optimal Cycle Length Model. Tehnicki Vjesnik. 25. 391-395.
