Blue square black diamond
In North America, the easiest ski trails are denoted by a green circle, intermediate trails by a blue square and advanced trails by a black diamond. Most ski areas also offer even more advanced terrain for experts, marked with a double black diamond or E and X for extreme terrain.For example, a blue square with a black diamond symbolizes a blueblack trail that is more difficult than a blue run but easier than a black. North American Ratings Green Circle: The easiest trails to ski. blue square black diamond
The Walt Disney Company was considering opening a ski resort and did studies and tests on which colors worked best. They came up with the current green circle for easiest runs, a blue square for intermediate, black diamond for advanced and double black diamond for expert.
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