A bi-level model to resolve conflicting transit priority requests at urban arterials

Mingtao Xu, Kun An, Zhirui Ye, Yuan Wang, Jiaxiao Feng, Jiahui Zhao

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)


Conflicting transit signal priority (TSP) requests can significantly influence the efficiency of TSP. Determining the best serve sequence for TSP requests is important for both the transit and other vehicles. The majority of previous studies focused on resolving conflicting TSP requests at the intersection level. For urban arterials, few studies take coordination into consideration, so the benefits of TSP may be lost due to the lack of progression. In view of this, this paper proposes a bi-level optimization model to resolve the problem of conflicting TSP requests at arterial corridors. The upper level of the model is progression control and the lower level is intersection control. At the progression control level, by considering the characteristics of bus operation, this paper proposes a signal coordination method that generates a green band between the two adjacent bus stops (stop-to-stop). At the intersection control level, a linear programming model is developed to resolve conflicting TSP requests. Then, this paper uses a hybrid genetic algorithm to solve the proposed model. Finally, an arterial with seven intersections in Nanjing, China, is selected to evaluate the performance of the proposed model. Three other models (the baseline model without TSP, Model 1 with the regular TSP and the classical coordination, and Model 2 with the lower model and the classical coordination) are also utilized to conduct the comparison analysis. The results show the proposed model can significantly reduce the bus passenger delay and stops compared to the three other models and meanwhile the operation of other vehicles will not turn worse.

Original languageEnglish
Pages (from-to)1353-1364
Number of pages12
JournalIEEE Transactions on Intelligent Transportation Systems
Issue number4
Publication statusPublished - Apr 2019


  • Analytical models
  • Bandwidth
  • Bi-level model
  • conflicting TSP requests
  • Delays
  • Intelligent transportation systems
  • Linear programming
  • Optimization
  • optimization
  • Signal resolution
  • stop-to-stop green band
  • urban arterials

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