Firefighting
Firefighter safety zone guidelines

The U.S. Forest Service publishes guidelines for the minimum distance a firefighter should be from a flame. As stated in the National Wildfire Coordinating Group's Incident Response Pocket Guide: "A safety zone is an area where a firefighter can survive without a fire shelter " and should be "...at least four times the maximum continuous flame height." However this figure only takes into account the effects of radiant heat and does not consider topography nor wind.

Safety Zones can be natural features such as rock screes, meadows, and river bars; or human-made features such a parking lots or areas that have been cleared of vegetation through mechanical means.
oulipo:avoid_letter[t], detectable_format:number_highlighted_sections[5], length_constraints:number_words[106]