All races are individual events, run at your own pace within the announced time limits, in limited autonomy. Limited autonomy means the ability of the participants to independently complete the distance between two food stations, both from nutritional, clothing and security point of view, while adapting to encountered or unforeseen problems (bad weather, physical problems, accidents, etc.).

This principle supposes, in particular, the following rules:

• Each runner must have the full mandatory equipment with him throughout the race. 
• He will carry this equipment for the entire duration of the race and it cannot be changed during the race.
• At any time during the race the referees can check the equipment. The runner is obliged to submit to these checks in good faith, under the risk of exclusion from the race.
• The participant must take care to ensure that, when leaving each station, he has the amount of drink and food necessary to cover the distance to the next station.
• It is forbidden to accompany the participants along any part of the route by a person not registered for the race, outside the tolerance zones which are clearly marked near the supply stations.
• It is not allowed to be accompanied by a dog or any other animal.
• A participant who agrees to be accompanied outside expressly designated areas contravenes the principle of limited autonomy. Referees who witness irregularities are authorized to sanction participants to guarantee the spirit of trail-running events.