硬路肩（HARD SHOULDER）指的是与车行道相邻并铺以具有一定强度路面结构的路肩部分（包括路缘带）。“硬路肩”是高速公路右边用黄线划出的一根车道，主要作用是让故障车临时停靠，以及紧急情况时，方便急救车辆通行。
通过回归分别建立了碰撞速度、碰撞角度与平曲线半径及转向、运行速度、硬路肩宽度的相关模型。
The models of collision speed and collision Angle relating to horizontal curve radium and its direction, hard shoulder width and operation speed are derived by regression.
跟公路赛车不同，驾驶舒适性不在方程式弹簧的考虑范围，阻尼比也非常硬，以确保撞击路面颠簸和路肩的影响尽可能快地缓和。
Unlike road cars, occupant comfort does not enter the equation - spring and damper rates are very firm to ensure the impact of hitting bumps and kerbs is defused as quickly as possible.
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