Changes in lateral clearance are prone to drastic changes in the driving environment at the entrance and exit of the tunnel, which can cause a driver to become psychologically stressed and deviate from the center of a lane, thus creating a greater security risk. However, most of the existing regulations and studies only focus on the horizontal and vertical alignment of the tunnel entrances and exits, and there are few studies on the influence of lateral clearance on driving behavior. This study hired 15 random subjects to conduct real vehicle tests in eight tunnels on expressways with 3 design speeds by using a CAN-OBD analyzer and steering wheel angle meter. First, in five lateral clearance variation schemes, different speed characteristic indicators and steering wheel angles were selected as the indicators of driving behavior. Second, the interactive influence of the design speed, lateral clearance, operating speed, steering wheel angle, and other indicators were analyzed. Finally, paired t-test analysis and Wilcoxon and Friedman nonparametric tests were used to compare the differences in various indicators among different lateral clearance schemes. The results showed that when the left lateral clearance is 1.5 meters, the operating speed is increased by 3.9%, while the standard deviation of speed is small, and the driving performance is higher. When the right lateral clearance is 1.75 and 2.00 meters, the operating speed is not much different. However, the latter’s speed standard deviation is smaller. By contrast, when the right lateral clearance is up to 2.25 m, the operating speed increases by 3.7%. However, the speed standard deviation also increases. Different lateral clearances have little effect on the steering wheel angle. The operating speed on the right side is higher and more stable when the design speed is 100 km/h. This study provides scientific suggestions for the setting of the lateral clearance of the tunnels.

中文翻译：

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基于高速公路现场数据的隧道横向净空对行车行为的交互影响分析

横向间隙的变化易于在隧道的入口和出口处改变驾驶环境，这可能导致驾驶员心理压力增大并偏离车道中心，从而带来更大的安全风险。但是，现有的大多数法规和研究都只关注隧道出入口的水平和垂直对齐，而关于侧向间隙对行车行为的影响的研究很少。这项研究通过使用CAN-OBD分析仪和方向盘角度计，雇用15名随机受试者在3条设计速度的高速公路上的8条隧道中进行了真实的车辆测试。首先，在五个横向间隙变化方案中，选择了不同的速度特性指标和方向盘角度作为驾驶行为的指标。第二，分析了设计速度，横向间隙，运行速度，方向盘转角和其他指标的交互影响。最后，配对Ť-检验分析以及Wilcoxon和Friedman非参数检验用于比较不同横向间隙方案之间各种指标的差异。结果表明，当左侧横向间隙为1.5米时，行驶速度提高3.9％，而速度标准偏差小，行驶性能更高。当右侧横向间隙为1.75和2.00米时，运行速度没有太大差异。但是，后者的速度标准偏差较小。相反，当右侧横向间隙最大为2.25 m时，运行速度将提高3.7％。但是，速度标准偏差也会增加。不同的侧向间隙对方向盘角度影响很小。当设计速度为100 km / h时，右侧的操作速度更高且更稳定。