Navigating Trails: Trail Difficulty Ratings
FAST utilizes the IMBA Trail Difficulty Rating System. A basic method used to categorize the relative technical difficulty of recreation trails.
The IMBA Trail Difficulty Rating System can:
Help trail users make informed decisions
Encourage visitors to use trails that match their skill level
Manage risk and minimize injuries
Improve the outdoor experience for a wide variety of visitors
Aid in the planning of trails and trail systems
This system was adapted from the International Trail Marking System used at ski areas throughout the world. Many trail networks use this type of system, most notably resort-based mountain biking trail networks. The system applies to mountain bikers best, but also is applicable to other visitors such as hikers and trail runners.
Source: International Mountain Biking Association - https://www.imba.com/resource/trail-difficulty-rating-system