13. A diagram of the ski slopes and ski lifts shall be displayed between the reception centre and the Alpine ski slopes.The diagram shall indicate:
(1) for each Alpine ski slope:(a) its track;
(b) its name or number, or both;
(c) its level of difficulty by means of pictographs 200, 201, 202 or 203 in Schedule 1;
(2) the track of each ski lift by means of an unbroken red line;
(3) a legend specifying the levels of difficulty of pictographs 200, 201, 202 and 203.