Standard Method of Test for Producing Drawdown Panels and Measuring the Coefficient of Retroreflected Luminance (RL) of Pavement Markings in a Laboratory Panel
在实验室面板中生产下拉面板和测量路面标线反向反射亮度系数(RL)的标准试验方法
This test procedure is used to determine the retroreflectivity of AASHTO M 247 Type I highway beads. Beads are dropped on top of a uniform thickness of paint and retroreflectivity is determined with a reflectometer.