When we see a system that is inaccessible it is worth trying to work out the reasons for the choices that have been made. People are not stupid, and if the system has features that make it inaccessible to some group, the reason is usually provide advantages that are a higher priority than accessibility. For example, in parts of the world buses are still built on truck chasses (Figure 1). This provides a robust low-cost vehicle, suitable for rough roads and easy to maintain, but the penalty is a high floor and steep steps. The operator has prioritised practicality over ease of use by passengers