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LU Bin, NIU Hui-min. Signal timing optimization at isolated intersections under random condition[J]. Journal of Traffic and Transportation Engineering, 2010, 10(6): 116-120. doi: 10.19818/j.cnki.1671-1637.2010.06.019
Citation: LU Bin, NIU Hui-min. Signal timing optimization at isolated intersections under random condition[J]. Journal of Traffic and Transportation Engineering, 2010, 10(6): 116-120. doi: 10.19818/j.cnki.1671-1637.2010.06.019
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Signal timing optimization at isolated intersections under random condition

doi: 10.19818/j.cnki.1671-1637.2010.06.019

  • School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China

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  • Author Bio:

    LU Bin(1975-), male, associate professor, doctoral student, +86-931-4938025, jdlbxx@mail.lzjtu.cn

    NIU Hui-min(1963-), male, professor, PhD, +86-931-4938015, hmniu@mail.lzjtu.cn

  • Received Date: 2010-07-04
  • Publish Date: 2010-12-25
    Abstract
  • The stochastic characteristic of traffic flow was analyzed at isolated intersection, the deviation of queue length of phase vehicles correlating to the expected queue length was studied, the weights of all phases were considered, and an optimization model of signal timing was proposed. The quantitative relationships among phase clearance reliability (PCR), signal cycle and green time were determined, a deterministic transformation was achieved for the model, and a simulation example of two-phase signalized intersection was analyzed by using the model. The result indicates that when the variance of arrival rate increases from 0 to 350 pcu·s-1, the cycle length increases from 50 s to 232 s, and the phase with the larger variance of arrival rate needs much green time. When the queue length increases from 4 pcu to 30 pcu, the phase clearance reliability only increases from 0.712 to 0.884. The random variation of arrival rate has an obvious effect on traffic signal setting, and the model is correct.

     

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