This standard specifies a method for evaluating the washable performance of traffic coatings under exposure to simulated rainwater conditions. It tests the performance of coatings under different intensities of rainwater by using a steady flow of water produced by a faucet to simulate heavy rain. This method enables the evaluation of the washable performance of gluing agents and Miscellaneous components in coatings and helps to compare the performance of different types of traffic coatings in practical applications. Suitable for the testing of conventional and fast-drying water-based traffic coatings to ensure that they can withstand rainwater initializing shortly after construction.