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SHAO Hai-peng, LU Ji-na, DONG Hai-qian. Delay comparison between through-left lane and left turn lane for at-grade intersection with permitted left turn control[J]. Journal of Traffic and Transportation Engineering, 2016, 16(3): 142-148. doi: 10.19818/j.cnki.1671-1637.2016.03.017
Citation: SHAO Hai-peng, LU Ji-na, DONG Hai-qian. Delay comparison between through-left lane and left turn lane for at-grade intersection with permitted left turn control[J]. Journal of Traffic and Transportation Engineering, 2016, 16(3): 142-148. doi: 10.19818/j.cnki.1671-1637.2016.03.017
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Delay comparison between through-left lane and left turn lane for at-grade intersection with permitted left turn control

doi: 10.19818/j.cnki.1671-1637.2016.03.017
  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    Key Laboratory of Highway Engineering of Ministry of Education, Changsha University of Science and Technology, Changsha 410004, Hunan, China

  • 3.

    Xi'an City Planning and Design Institute, Xi'an 710082, Shaanxi, China

More Information
  • Author Bio:

    SHAO Hai-peng(1978-), male, associate professor, PhD, +86-29-82334886, shaohp@gfscw.cn

  • Received Date: 2016-01-11
  • Publish Date: 2016-06-25
    Abstract
  • In order to compare the delays of exclusive left turn lane and through-left shared lane in permitted left turn phase, the operation laws of traffic flow under two left turn traffic organization modes were analyzed.Based on the gap acceptance theory, the arrival rate and the left turn vehicle percentage were taken as variables to build the delay models for two left turn traffic organization modes with Poisson arrival londition respectively.The geometric design and signal control data of a intersection in Xi'an were taken as example to analyze the delays.Calculation result shows that total delays increase with the increase of arrival rate and left turn vehicle percentage.When arrival rate is smaller, the delay with exclusive left turn lane is larger.The delay with through-left shared lane gradually approaches or even overtakes the delay with exclusive left turn lane with the increase of arrival rate.Through-left shared lane is suitable for smaller traffic demand, and exclusive left turn lane is suitable for larger traffic demand.When arrival rate is no more than 0.12 pcu·s-1, or arrival rate is 0.12-0.18 pcu·s-1 and left turnvehicle percentage is no more than 0.2, through-left shared lane layout is recommended.When arrival rate is no less than 0.18 pcu·s-1, or arrival rate is 0.12-0.18 pcu·s-1 and left turn vehicle percentage is more than 0.2, exclusive left turn lane layout is recommended.

     

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