IMDEA Networks Institute Publications Repository

Fair, Real-Time Control of a Traffic Signal

Li, Hui and Maxemchuk, Nicholas F. and Gu, Yitian and Zhang, Guoxia (2012) Fair, Real-Time Control of a Traffic Signal. In: The 91st Transportation Research Board Annual Meeting (TRB 2012), 1 - 26 January 2012, Washington DC, USA.

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Information on the vehicles approaching an intersection is used to control the traffic signal in order to reduce delay fairly. Two fairness mechanisms, min-max fairness and proportional fairness, are defined. Min-max fairness minimizes the maximum delay of vehicles, and is fair from the perspective of the vehicles, and proportional fairness minimizes the delays of vehicles controlled by a phase of the traffic signal, and is fair from the perspective of the traffic signal. These fairness mechanisms are compared with an earlier mechanism that minimizes the average delay and with fixed cycle traffic signals. The comparisons for a range of arrival rates, and for both balanced and unbalanced loads on the approaches to the signal, are performed. All of the real-time mechanisms are similar at low to moderate loads, and provide a significant improvement over the fixed traffic signal. This is expected because vehicles don’t wait at a red light when there are no vehicles passing through the intersection. As the load increases: Minimum delay control has a significantly smaller delay than fixed control, but treats some vehicles extremely unfairly; the average delay of min-max fairness may be slightly greater than fixed control, but the individual vehicles are treated much more fairly; and, proportional fairness reduces the average delay close to that of minimum delay control, and treats the individual vehicles almost as fairly as min-max fairness. Based upon this study, proportional fairness is recommended to control traffic signals.

Item Type: Conference or Workshop Papers (Paper)
Uncontrolled Keywords: Actuated traffic signal controllers; Queuing; Real time information; Traffic delay; Traffic signal control systems
Subjects: Q Science > Q Science (General)
Q Science > QA Mathematics > QA75 Electronic computers. Computer science
T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering, Science and Mathematics > School of Electronics and Computer Science
Depositing User: Rebeca De Miguel
Date Deposited: 29 Jan 2013 12:08
Last Modified: 16 Jun 2017 11:33

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