Optimal Signal Control in Urban Road Networks with High Priority Congested Centers

Document Type : Research Paper


1 Associate Professor, Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

2 Ph.D. Candidate, Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

3 Ph.D. Grad., Department of Industrial Engineering, Tarbiat Modares University, Tehran, Iran


Keeping the density of traffic flow and air pollution in an acceptable level and developing a good capacity for transit in the high priority areas of the city, is really a big deal in large and crowded cities. To address this problem, a new method of intersection signal optimization is presented in this paper. Based on network fundamental diagrams, an Internal–External Traffic Metering Strategy (IETMS) is developed for controlling density of traffic in high priority areas globally. Protecting the network from gridlock, optimizing the queue ratios in entrance arterials and utilizing the reserved capacity are the main objectives of the problem. The methods of mixed integer linear programming and quadratic programming are used for solving the problem. A traffic simulator software (VISSIM) has been used for simulation in which the coded program is developed in VISSIM-COM interface. Finally the model is applied in a part of urban network of Tehran, Iran. The results show that redistributing of traffic density in the whole network and protecting high density areas from gridlock can efficiently improve traffic flow measurement in high priority areas.


- Choi, B. K. (1997) “Adaptive signal control for oversaturated arterials”, Submitted In Partial Fulfillment of The Requirement For The Degree Of Doctor of Philosophy, Transportation Planning And Engineering, Polytechnic University.
- Daganzo, C. F. (2007)” Urban gridlock: Macroscopic modeling and mitigation approaches”, Transportation Research Part B, 41, pp.49–62.
- Ekbatani, M. K., Kouvelas, A., Papamichail, I. and Papageorgiou, M. (2012) “Exploiting the fundamental diagram of urban networks for feedback-based gating”, Transportation Research Part B, pp.1393-1403.
- Gal-Tzur, A., Mahalel, D. and Prashker, J. N.(1993) “Signal design for congested networks based on metering”, Transportation Research Record 1398, TRB, Washington, D.C., 1993, pp. 111–118.
- Lieberman, E. B., Chang, J. and Prassas, E. S. (2000) “Formulation of real-time control policy for oversaturated arterials”, Transportation Research Record 1727, Paper No. 00- 1672.
- TV-vision, VISSIM 5.4 user manual (2012) “PTV Planung Transport Verkehr AG”, 76131 Karlsruhe, Germany - PTV-vision, VISSIM 5.40-07.
- COM interface manual (2012) “PTV AG 2012 Planung Transport Verkehr AG” Stumpfstraße 1 D-76131, Karlsruhe, Germany.
- Rathi, A. K. (1988) “A control scheme for high traffic density sectors”, Transportation Research B, Vol. 22B, No.2, pp. 81–101 - Rathi, A. K. (1991) “Traffic metering: An effectiveness study”, Transportation Science, July, pp. 421-440.