At what slope percentage do slopes become difficult to walk on?

Slopes become difficult to walk on typically at a percentage of around 10%. At this gradient, individuals may begin to experience physical fatigue and balance challenges, which can make walking a strenuous task, particularly for those who may not be in top physical condition or have mobility issues.

As slopes increase beyond this percentage, the challenge in traversing them becomes even more pronounced, with greater risks associated with slips, trips, and falls. While slopes rated over 5% may still be manageable for many, it's generally agreed upon that navigating at or above 10% can significantly hinder ease of movement.

Understanding the implications of slope percentages is crucial in architectural design and site planning, as it influences accessibility, safety, and comfort in public and private spaces.