What is the maximum slope allowed for ramped aisles that are part of an accessible route?

The maximum slope allowed for ramped aisles that are part of an accessible route is set to ensure safety and usability for individuals with disabilities. A slope of 1 unit vertical in 12 units horizontal (commonly expressed as a 1:12 ratio) is the standard for accessible ramps. This ratio allows for a gentle incline that is manageable for wheelchair users and others relying on accessibility features, thereby facilitating smoother navigation.

Ramps with a steeper slope can pose significant challenges, making it difficult for individuals to ascend or descend safely. The 1:12 slope strikes a balance between being accessible and ensuring safety, as it reduces the risk of accidents, fatigue, or difficulty in maneuvering.

Other ratios listed as alternatives—1:8, 1:16, and 1:24—do not meet the criteria for general accessibility for ramped aisles. The steeper slopes (1:8) would be too challenging, while excessively gentle slopes (1:16 and 1:24) could be inappropriate for most applications where space is limited or practical considerations must be taken into account. Thus, the 1:12 ratio is the widely accepted standard, ensuring compliance with accessibility guidelines.