Abstract
The off-ramps of urban expressways can assume various forms. Compared with other countries, many off-ramps in China have special Chinese characteristics; for example, the off-ramps are extremely short and connected to urban roads and intersections within a short distance. Thus, many foreign control methods may not be suitable for use in China. This paper provides a dual-phase signal timing optimization model for an intersection connected to the off-ramp of an urban expressway that has special Chinese characteristics. This model is solved by an improved genetic algorithm. To better evaluate traffic conditions, this paper also establishes methods by which stranded vehicles can be identified and the traffic flow at intersections can be predicted. The performance of the optimized signal timing is tested with PTV Vissim software, and the timing plan is calculated by MATLAB using an actual scenario in Xi’an, China. The optimized effect of the proposed model is tested under different flow conditions by changing the input traffic flow of the intersection. The results show that at the peak time, the stops, delays and queue lengths of the whole intersection are reduced by 29.0%, 27.8% and 23.7%, respectively, compared with the original plan and by 7.7%, 14.5% and 11.9%, respectively, compared with the plan from the single-phase model. This dual-phase model can prevent congestion from spillback onto urban expressways as well as reduce delays and stop times at intersections, especially in a supersaturated state. In general, this model can be used to address signal timing in ordinary urban intersections.
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Acknowledgements
This paper is supported by the National Students’ Platform for Innovation and Entrepreneurship Training Program in China (NO. 201910710012).
Funding
This study was supported by National Students’ Platform for Innovation and Entrepreneurship Training Program in China (NO.201910710012), Natural Science Foundation of Shaanxi Province of China (2020GY-027), the Fundamental Research Funds for the Central Universities (300102249317) and the National Natural Science Foundation (71871028).
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Shiwei Liu and Ying Li conceived and designed the study. Baokun Zhang and Yinghan Qiu performed the experiments. Shiwei Liu and Shurong Qiu took charge of the programming work. Xingtong Liu and Baokun Zhang reviewed and edited the manuscript. All authors read and approved the manuscript.
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Liu, S., Li, Y., Qiu, Y. et al. Signal Timing Optimization Algorithm for an Intersection Connected with an Urban Expressway. Arab J Sci Eng 45, 8667–8684 (2020). https://doi.org/10.1007/s13369-020-04835-6
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DOI: https://doi.org/10.1007/s13369-020-04835-6