Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (7): 1903-1912.doi: 10.13229/j.cnki.jdxbgxb.20221108

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Safety evaluation method for pedestrians crossing street at signalized intersection considering secondary conflict of right-turn vehicles

Guo-zhu CHENG1(),Lin SHENG1,Hao-yu WANG1,Tian-jun FENG2   

  1. 1.School of Traffic and Transportation，Northeast Forestry University，Harbin 150040，China
    2.School of Transportation Science and Engineering，Jilin University of Architecture，Changchun 130118，China
  • Received:2022-08-29 Online:2024-07-01 Published:2024-08-05

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Abstract:

In order to study the safety of pedestrians crossing the street during the second conflict between people and vehicles at signalized intersections， three signalized intersections in Kunming City， Yunnan Province were selected as the research objects， and the traffic conflict analysis software T-Analyst was used to obtain vehicle trajectory data and traffic conflict data. A multi-angle safety evaluation method was adopted， based on the DV framework to judge the initial situation of the person-vehicle conflict， the traffic conflict indicators PETS and PETH， the maximum rejection gap and acceptance gap， and the average crossing speed to analyze the safety of pedestrians crossing the street. The results show that compared with the secondary conflict， the initial conflict situation faced by pedestrians in the primary conflict is more dangerous， and the frequency of pedestrians choosing to cross the street at risk is also higher. There is no significant difference in the secondary human-vehicle conflict in the indicators such as vehicle crossing behavior， traffic conflict indicators PETS and PETH， maximum rejection gap， acceptance gap， and critical gap. However， the average crossing speed of the secondary conflict was significantly higher than that of the primary conflict， and the potential risk of pedestrian crossing was higher in the secondary conflict.

Key words: engineering of communications and transportation system, secondary conflict of right-turn vehicle, signalized intersection, safety evaluation

CLC Number: 

  • U491.7

Fig.1

Signal intersection floor plans"

Table 1

Signal intersection phase setting scheme"

相位1相位2相位3相位4
南北直行南北左转东西直行东西左转

Table 2

Description of signalized intersection information"

信号交叉口名称进口道名称路缘石转弯半径/m主要冲突处人行横道长度/m次要冲突处人行横道长度/m拍摄日期
北京路-北辰大道北辰大道西进口34.549.265.92022年1月28日
北辰大道东进口37.252.569.32022年1月29日
北辰大道-金石路北辰大道西进口35.358.746.32022年2月10日
北辰大道东进口40.058.945.62022年2月11日
北京路-东风东路北京路北进口26.452.041.82022年2月15日

Fig.2

Schematic diagram of map calibration"

Fig.3

Schematic diagram of the primary conflict and the secondary conflict at the intersection"

Fig.4

DV frame diagram"

Fig.5

Vehicle yielding behavior and pedestrian crossing decision in DV framework"

Table 3

Mann-Whitney U test results for ordinal variables"

变量P值
初始冲突情况<0.01
车辆让行行为0.701
行人过街决策<0.01

Table 4

ANOVA test results for continuous variables"

变量P值
PETS0.794
PETH0.292
最大拒绝间隙0.758
接受间隙0.700
发生冲突平均过街车速<0.01
无冲突平均过街车速<0.01

Table 5

Summary of safety evaluation results"

冲突类别主要冲突次要冲突
初始冲突情况138100
阶段一冲突概率/%00
阶段二冲突概率/%17.44
阶段三冲突概率/%82.696
车辆让行行为138100
让行率/%97.897
合规让行率/%97.897
行人过街决策--
车辆到达前行人过街总数169131
阶段一冲突概率/%00
阶段二冲突概率/%14.83.8
阶段三冲突概率/%85.296.2
PETS均值/s2.042.00
标准差1.050.88
85%位PETS/s3.13.06
15%位PETS/s1.171.3
PETH均值/s2.512.76
标准差1.531.44
85%位PETH/s3.514.11
15%位PETH/s1.261.27
最大拒绝间隙均值/s3.963.86
标准差2.682.23
85%位最大拒绝间隙/s6.456.47
15%位最大拒绝间隙/s1.441.5
接受间隙均值7.857.67
标准差3.043.15
85%位接受间隙/s11.1510.57
15%位接受间隙/s5.214.44
发生冲突平均过街车速均值/（m·s-1）2.973.98
标准差1.011.87
85%位车速/（m·s-1）3.775.73
15%位车速/（m·s-1）2.012.44
无冲突平均过街车速均值/（m·s-1）5.046.46
标准差1.501.87
85%位车速/（m·s-1）6.58.48
15%位车速/（m·s-1）3.564.53
特殊冲突发生概率/%00

Fig.6

person-vehicle conflict PET box plot"

Fig.7

Maximum rejection gap vs acceptance gap box plot"

Fig.8

Cumulative frequency distribution of maximum rejection gap and acceptance gap"

Fig.9

average cross-street speed box plot"

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