|Table of Contents|

Operating speed model of passenger car at singlelaneentrance of interchange(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2018年04期
Page:
71-79
Research Field:
交通工程
Publishing date:

Info

Title:
Operating speed model of passenger car at singlelaneentrance of interchange
Author(s):
ZHANG Chi;  GONG Quanli;  MA Xiangnan;  ZHANG Min;  QI Chen
(1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Changan University,Xian 710064, Shaanxi, China; 2. CCCC First Highway Consultants Co., Ltd., Xian 710075, Shaanxi, China;3. Central and Southern China Municipal Engineering Design Institute Limited, Wuhan 430010, Hubei, China;4. School of Highway, Changan University, Xian 710064, Shaanxi, China)〖ＪＺ）〗〖HJ4mm〗
Keywords:
traffic engineering;  operating speed model;  SPSS regression analysis;  ramp entrance;  triangle segment;  accelerate change lane segment
PACS:
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DOI:
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Abstract:
The aim of this study was to determine the characteristics of a cars operating speed at a singlelane entrance of an interchange, and to calculate a running speed model of cars at the entrance of a freeway interchange，to ensure coordination of operating speed in the convergence section for improved vehicle safety. Based on the analysis of the measured data of passenger cars at the entrance of a single lane at an expressway interchange, the law of operation of a passenger car at the entrance was obtained. The speed of the passenger car at the entrance was collected in real time. The chain Kepler radar velocimeter was used to collect vehicle speed at entrance in real time. The feature points (including the starting point of the tapered section, diversion point, and the small nose point) of eight ramps were selected as the analysis sample for vehicle speed in the freeflow state. The KS test was used to test the normal distribution of the samples. When the KS test requirement was met, the speed and acceleration characteristics in the tapered section and deceleration section were analyzed，and the parameters of the independent variables were determined. Finally, SPSS software was used to perform the regression, and the operation speed prediction model of the passenger cars at the diversion point and the small nose points was developed. Then, the model was verified using data from four ramps. The results show that the running speed at the junction point is positively correlated with the velocity of the converging nose and the length of the triangle section, but negatively correlated with the reciprocal of the horizontal curve radius. The running speed at the end of the acceleration lane is positively correlated with the velocity of the converging nose and the length of the acceleration lane, but negatively correlated with the reciprocal of the horizontal curve radius. In addition, the predicted model was successfully tested using a regression equation, regression parameters, and average relative error checking. The relative error in the predicted value and measured value is less than 10%. The established regression model met the precision requirements. The results of the study are a good supplementary explanation of the relevant regulations of running speed of the standards in Guidelines for Safety Audit of Highway (JTG B05-2015). This study provides theoretical support and references for expressway safety evaluation and design. 9 tabs, 4 figs, 23 refs.

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Last Update: 2018-08-03