When designing for accessibility, which feature is critical for those using wheelchairs?

When considering accessibility for individuals using wheelchairs, ramps are critical because they provide a way to navigate changes in elevation without the use of stairs, which are not accessible for wheelchair users. Ramps offer a gentle slope that allows wheelchair users to ascend or descend without assistance, thereby promoting independence and mobility.

Elevators, while also important, are not always available in every building or instance where a change in elevation occurs. Automatic doors facilitate entry and exit, but they do not directly address the need for navigating slopes or levels. Stairs, on the other hand, pose a significant barrier for wheelchair users and do not provide an accessible route. Therefore, ramps are the primary feature that enables safe and effective movement for individuals using wheelchairs in a built environment.