Hochheiser, HarrySheiderman, BenSignposts at ski areas help skiers to choose slopes that match their skills and equipment. They describe easy, intermediate and expert trails, indicate which ones are groomed, and give their length or vertical drop. Skiers use this information to make informed decisions, avoiding routes that may be too difficult or too long. They may choose different skis or waxes depending on the conditions.en-USTechnical Report