本试验方法包括使用以20度角安装的轮胎（此处称为装置）测量铺砌表面的侧向摩擦力。本试验方法利用由一个装置获得的测量值，该装置包含一个与运动方向成20度角的自由旋转试验轮，并在试验轮承受垂直载荷时，以工作速度在路面上运行。测试设备安装在许多不同的车辆底盘上，其功能独立于车辆选择。该方法提供沿被测路面全长的侧向力摩擦数据（以及其他数据）。这些数据用于将路面的某些摩擦特性与其他路面的摩擦特性进行比较，或用于评估路面摩擦特性随时间的变化。这些数据不足以确定在潮湿或干燥路面上停车所需的距离。

This test method covers the measurement of the sideway-force friction of paved surfaces using a tire mounted at 20 degrees, herein referred to as the device.This test method utilizes the measurements obtained by a device, containing one freely rotating test wheel angled at 20 degrees to the direction of motion, and operated over a pavement surface at operating speed while the test wheel is under a vertical load. The test equipment has been built onto a number of different vehicle chassis and functions independently of vehicle choice. This method provides data of the sideway-force friction (and other data) along the whole length of the pavement surface being tested. The data are intended for use in comparing certain frictional properties of a pavement relative to those of other pavements or for evaluating changes in these frictional properties of a pavement with the passage of time. The data are insufficient to determine the distance required to stop a vehicle on either a wet or a dry pavement.