| Citation: | WANG Siqi, PAN Cunshu, Zhang Heshan, XU Jin. An Analysis of Vehicle Operating Characteristics of Deceleration Strips on Mountain Roads[J]. Journal of Transport Information and Safety, 2021, 39(5): 108-116. doi: 10.3963/j.jssn.1674-4861.2021.05.014
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An actual vehicle test is carried out at Jiangnan Interchange in the main urban area of Chongqing to study the influence of deceleration strips on vehicle operation on mountainous roads.The collected data of vehicle speed and acceleration is to analyze operation characteristics on the test road section.The results included that: ① The speed distribution bandwidth reaches a minimum value at about 40 m on both sides of the deceleration strips, and the speed bandwidth rebounces at the positions of deceleration strips, which indicates that there is a large difference in the vehicle speed at the location of the deceleration strips and is prone to a rear-end collision risk.② The deceleration strips have a strong effect on the speed selection behavior of drivers: the closer the two deceleration strips are to each other, the stronger the effect on the drivers'behaviors, and the better the deceleration effects.③ The greater the initial speed before passing the deceleration strips, the longer the required length of deceleration strips; meanwhile, the earlier the deceleration measures should be taken.The 85th percentile deceleration and acceleration length are 225 and 212 m, respectively.④ The acceleration and deceleration of the vehicle through the deceleration strips are closely related to the initial braking speed and the initial speed before acceleration.The more complex the road environments, the more significant the differences between deceleration and acceleration curves when the vehicle passes through the deceleration strips.⑤ The upper limit of speed reduction rate for vehicles can reach 0.9, and the lower limit rate increases with the increased initial speed.
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