It is the duty of the ski area operator to maintain the following signs and designations:
(1) Base Stations. A color code is established in accordance with the following: Green circle — To designate the ski area's least difficult trails and slopes;
(2) Black diamond — To designate the ski area's most difficult trails and slopes;
(3) Blue square — To designate the ski area's trails and slopes that fall between the green circle and black diamond designations;
(4) Yellow triangle with red exclamation point inside with a red band around the triangle — To designate danger areas; and
(5) Octagonal shape with red border around white interior with a black figure in the shape of a skier inside with a black band running diagonally across the sign from the upper right hand side to the lower left hand side with the word “closed” beneath the emblem — To designate a closed trail or slope; and
(6) A trail board shall be maintained at one (1) or more prominent locations at each ski area displaying that area's network of ski trails and slopes, with each trail and slope rated on the board in accordance with the color code in subdivision (1)(A) and containing a key to the code in accordance with the designations in subdivision (1)(A). The trail board shall further designate which ski trails and slopes are open and their condition; and
(7) Trails or Slopes. The ski area operator shall conspicuously mark the top of each trail or slope with the appropriate symbol for that particular trail's or slope's degree of difficulty in accordance with this chapter. Those portions of the trails or slopes that are of extra hazardous nature or are closed shall be marked at the top with the appropriate symbol; and
(8) Whenever maintenance personnel or equipment is being employed upon any trail or slope while such trail or slope is open to the public, the ski area operator shall place, or cause to be placed, a conspicuous notice to that effect at or near the top of such trail or slope.