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JRM Vol.26 No.5 pp. 607-615
doi: 10.20965/jrm.2014.p0607
(2014)

Paper:

Network-Wide Optimization of Traffic Signals Using Mixed Integer Programming

Md. Abdus Samad Kamal*1, Jun-ichi Imura*2, Tomohisa Hayakawa*2,
Akira Ohata*3, and Kazuyuki Aihara*4

*1Japan Science and Technology Agency and Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan

*2Department of Mechanical and Environmental informatics, Tokyo Institute of Technology, 2-12-1-W8-1 Ookayam, Meguro-ku, Tokyo 152-8552, Japan

*3Toyota Motors Corporation, Sizuoka 410-1107, Japan

*4Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan

Received:
April 14, 2014
Accepted:
July 28, 2014
Published:
October 20, 2014
Keywords:
traffic signal control, hybrid dynamical systems, mixed integer programming, model predictive control
Abstract
Network with four intersections

In this paper a network-wide traffic signal control scheme in a model predictive control framework using mixed integer programming is presented. A concise model of traffic is proposed to describe a signalized road network considering conservation of traffic. In the model, the traffic of two sections that belong to a traffic signal group of a junction are represented by a single continuous variable. Therefore, the number of variables required to describe traffic in the network becomes half compared with the models that describe section wise traffic flows. The traffic signal at the junction is represented by a binary variable to express a signal state either green or red. The proposed model is transformed into a mixed logical dynamical system to describe the traffic flows in a finite horizon, and traffic signals are optimized using mixed integer linear programming (MILP) for a given performance index. The scheme simultaneously optimizes all traffic signals in a network in the context of model predictive control by successively extending or terminating a green or red signal of each junction. Consequently, traffic signal patterns with the optimal free parameters, i.e., the cycle times, the split times and the offsets, are realized. Use of the proposed concise traffic model significantly reduces the computation time of the scheme without compromising the performance as it is evaluated on a small road network and compared with a previously proposed scheme.

Cite this article as:
M. Kamal, J. Imura, T. Hayakawa, <. Ohata, and K. Aihara, “Network-Wide Optimization of Traffic Signals Using Mixed Integer Programming,” J. Robot. Mechatron., Vol.26, No.5, pp. 607-615, 2014.
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