Objects that are located at different heights are (e.g., a tree’s branch that hangs on the walkway) difficult to be detected by blind people but bear a high potential for collisions and injury.

In this task, pilots must navigate through a maze of obstacles which are located at different heights.

Blind people use a white cane to detect changes in terrain, such as the boundary between a paved path and the lawn on the side. However, the cane can get stuck on protruding roots, stones or potholes which is unpleasant for the user.

In this task, pilots must follow a path without touching the ground on the side.

Many user interfaces are nowadays based on touch screens (e.g., vending machines, the menu in restaurants). Their use is primarily based on visual perception, and they rarely provide the necessary accessibility for the blind.

In this task, pilots must navigate a touch screen and order a predefined item from a variety of foods and drinks.

Finding an empty seat (e.g., when travelling on a train or visiting a theatre) is a challenge for blind people.

In this task, pilots must identify the empty seats.