关键词: 智能交通, 可靠性, 信号优化模型, 信号交叉口

Abstract:

Transit signal priority (TSP) is widely used to improve the traffic capacity and service level. However, TSP strategy often destroys the reliability of road network, thus unreliability at signalized intersection is an important problem need to be addressed in TSP strategy. This paper proposes a TSP optimization model at signalized intersection. The objective function is minimizing average person delay and phase clearance reliability is taken as an important constraint in the model. This optimization model can reduce average person delay while ensuring the reliability at signalized intersection. The sensitivity analysis in case study shows that increasing the reliability requirement will cause the delay time to increase nonlinearly, meanwhile, reducing only the person delay may cause lower reliability level. Thus, it is necessary to consider both of delay and reliability in the signal optimizing model. By comparing the experimental results obtained by the conventional approach and optimizing model based on reliability, this paper proves the efficient performance of the proposed model.

Key words: intelligent transportation, reliability, signal optimizing model, signalized intersection