What is the purpose of an alternating tread device?

The purpose of an alternating tread device is to allow for easier ascent and descent in tight spaces. These devices are designed to provide a more compact and efficient means of navigating vertical heights compared to traditional stairs. They typically feature a tread that alternates in direction, which allows users to climb or descend with a more natural foot placement. This design is particularly useful in areas where space is limited, as it reduces the overall footprint of the stairs while maintaining safety and functionality.

In contrast, while providing extra grip, saving space, or facilitating quick exits could be beneficial attributes, they do not encompass the primary function of an alternating tread device. Its main advantage lies in enhancing accessibility and usability in confined areas, making it particularly advantageous in commercial buildings where maximizing space is a common design consideration.