Journal
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volume 503, Issue -, Pages 71-85Publisher
ELSEVIER
DOI: 10.1016/j.physa.2018.02.170
Keywords
Urban traffic system; Pre-signal; Macroscopic fundamental diagram
Categories
Funding
- Key Research and Development Program, China [2016YFC0802508]
- National Natural Science Foundation of China [11672289, 11422221]
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Pre-signal is an additional traffic light proposed in traffic system to improve the left-turning efficiency of intersections. The efficiency of pre-signals in a networked environment will be affected by the coordination of pre-signals and the intersection traffic lights. In this paper, we study the implementation of pre-signal in a Manhattan-like urban traffic system based on a microscopic cellular automaton model. The pre-signals are located before the normal traffic lights, and have two phases (left-turning phase and through phase) for the aim of segregating left-turning and through vehicles into separate sets of lanes. We propose a reliable method to coordinate the intersection traffic light period and phases with the pre-signal period and phases. Simulation results show that the pre-signals can improve the performance of the system, for both closed and open boundaries. The macroscopic fundamental diagram of the system shows a much higher traffic flow for a wide range of densities. Moreover, the effect of pre-signal area length also needs to be considered in a networked environment. We find that the optimal length of pre-signal area should be determined by the number of vehicles passing the traffic light in a left-turning phase at the intersection. The results can help the implementation and application of pre-signal in real traffic system. (C) 2018 Elsevier B.V. All rights reserved.
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