Trail difficulty rating system

A trail difficulty rating system, also known as walking track grading system, walk gradings or trail grades, is a classification system for trails or walking paths based on their relative technical and physical difficulty. A trail difficulty rating system informs visitors about the attributes of walking tracks and helps visitors, particularly those who are not usual bushwalkers, make decisions to walk on trails that suit their skill level, manage their risk, improve their experience and assist in the planning of trails and trail systems.

Source: Wikipedia — Trail difficulty rating system (CC BY-SA 4.0)