山区城市道路交叉口纵向减速标线影响

道路交通安全问题是一个受各种因素影响的复杂的系统问题，受不同的驾驶员特性、汽车性能、道路条件及环境之间的相互影响。对速度的分析应该从实际的行驶环境出发，结合车辆行驶轨迹和其他事故致因系统分析。本文通过实车试验的方法对设置纵向减速标线的山区城市道路交叉口路段和未设置标线的对比路段的交通流量、区间速度、驾驶员瞳孔指标和轨迹横向偏移量等试验数据进行采集，再结合山区城市道路交叉口处的交通特性和道路基本参数等数据，分析试验路段的交通流特性、驾驶员生理行为指标和轨迹规律。试验表明:在城市道路交叉口设置纵向减速标线后车辆在试验路段和对比路段的偏移量分布频率最大值42.62%和38.18%在（0.5，1]区间内；在山区城市道路交叉口段设置纵向减速标线可以提前警告驾驶员控制车速等有利的影响，提高交叉口行驶安全性。

Research on the effect of longitudinal deceleration line on urban road intersection in mountainous area

Road traffic safety is a complex system problem affected by various factors, which are influenced by different driver characteristics, vehicle performance, road conditions and environment. The analysis of the speed should be based on the actual driving environment and combined with the analysis of the vehicle track and other accident cause systems. Based on the real vehicle test method for setting up vertical speed hump mountain roads and urban road intersection is not set line comparison of road traffic flow, interval velocity, pilot pupil index and track lateral offset test data are collected, coupled with the mountains in urban road intersection traffic characteristics and basic parameters such as road data, analysis of the test section physiological behavior of traffic flow characteristics, the driver and the rule of the trajectory. The test shows that the maximum frequency of offset distribution of vehicles in test section and contrast section is 42.62% and 38.18% within the range (0.5, 1) after setting longitudinal deceleration marks at urban road intersections. The setting of longitudinal speed reduction mark at urban road intersections in mountainous areas can warn drivers in advance of favorable influences such as controlling speed and improve the driving safety at intersections.