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YAN Ya-dan, TONG Pei, NING Zuo-qiang, WANG Dong-wei. Quantitative evaluation method of traffic function reliability for urban arterial roads[J]. Journal of Traffic and Transportation Engineering, 2018, 18(3): 157-166. doi: 10.19818/j.cnki.1671-1637.2018.03.016
Citation: YAN Ya-dan, TONG Pei, NING Zuo-qiang, WANG Dong-wei. Quantitative evaluation method of traffic function reliability for urban arterial roads[J]. Journal of Traffic and Transportation Engineering, 2018, 18(3): 157-166. doi: 10.19818/j.cnki.1671-1637.2018.03.016
shu

Quantitative evaluation method of traffic function reliability for urban arterial roads

doi: 10.19818/j.cnki.1671-1637.2018.03.016
  • 1.

    School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China

  • 2.

    China Overseas Land and Investment Ltd., Hong Kong 999077, China

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    Abstract
  • A calculating model of traffic function reliability for urban arterial roads was established to quantitatively evaluate its achievement degree. The key features of traffic functions of arterial roads were analyzed, including the following three aspects: undertaking larger traffic volumes, having higher speed, and serving medium-long distance travel. The definition of traffic function reliability of urban arterial roads was proposed by the reliability theory. The travel speed and product of straight rates were selected as the corresponding indicators for the traffic function. The calculation method of traffic function reliability based on the probability theory was constructed. The threshold ranges of two calculation indicators were analyzed. The differencesand connections between the traffic function reliability and service level were compared. The traffic function reliability during the peak and off-peak hours was evaluated for two arterial road units in Zhengzhou. Calculation result shows that there is no correlation between the travel speed and product of straight rates, and they are further considered to be independent. The straight rates at the intersections between the arterial roads and branch roads are higher than those at the intersections between the arterial roads and sub-arterial roads. The four measured groups of straight rates are 0.271, 0.062, 0.229, and 0.034 higher, respectively. During the peak and offpeak hours, the traffic function reliability of Kexue Road, which connects the old district and high-tech development district, is 0.803 and 0.702, respectively. The achievement degree of traffic function on Kexue Road reaches a high level. The traffic function reliability of Dongfeng Road, which is located in the old district, is 0.386. The reliability characteristics and achievement degree of traffic function of Dongfeng Road are far lower than that of Kexue Road. The service levels of three intersections on Kexue Road are all level one. During the peak hours and off-peak hours, service levels of segments on Kexue Road are class B and C, respectively. The service levels during the peak hours of three intersections on Dongfeng Road are level two, level two, and level three, respectively, and the service level of segment on Dongfeng Road is class C. The service level of Kexue Road is better than that of Dongfeng Road in general. The evaluation results of traffic function reliability are basically consistent with the analysis results of service level. However, compared with the service level, the traffic function reliability for urban arterial roads can better reflect the function characteristics and effects of external factors on the urban roads traffic operation.

     

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