Test course. The braking tests shall be done on a flat test surface of sufficient length and width, with a maximum 2 per cent gradient, covered with packed snow. The snow surface shall be composed of a hard packed snow base at least 3 cm thick and a surface layer of medium packed and prepared snow about 2 cm thick. Both air temperature, measured about one meter above the ground, and snow temperature, measured at a depth of about one centimetre, shall be between -2 °C and -15 °C. It is recommended to avoid direct sun light, large variations of sun light or humidity, as well as wind. The snow compaction index measured with a CTI penetrometer 1 shall be between 70 and 90, preferably between 75 and 85.
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Test course. The braking tests shall be done on a flat test surface of sufficient length and width, with a maximum 2 per cent gradient, covered with packed snow. The snow surface shall be composed of a hard packed snow base at least 3 cm thick and a surface layer of medium packed and prepared snow about 2 cm thick. Both air temperature, measured about one meter above the ground, and snow temperature, measured at a depth of about one centimetre, shall be between -2 °C and -15 °C. It is recommended to avoid direct sun lightsunlight, large variations of sun light sunlight or humidity, as well as wind. The snow compaction index measured with a CTI penetrometer 1 penetrometer1 shall be between 70 and 90, preferably between 75 and 85.
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Sources: Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles