This is because most public spaces have not yet incorporated universal design concepts, instead simply designing for the height, weight, and strength of an average adult. This can, though, create unsafe and inconvenient spaces for many people, depriving the physically challenged, children, or the elderly of opportunities. When this becomes a problem, a great deal of money and community resources must be used to carry out improvements.
原因就在一般公共空間尚未導入通用設計的概念，只從成年人的身高、體型、力量為設計的思考出發，但這樣的產物卻會為很多人帶來不安全、不方便，無形中扼殺了那些不適用者的社會參與能力，事後又要花更多社會資源進行改善。