According to a CIP survey, in 2006 there were about 500 illegal structures inhabited by urban Aborigines, accounting for some 0.7 % of their 71,604 total homes. These figures demonstrate that urban Aborigines who move under city bridges are a disadvantaged group within a disadvantaged group.
根據原民會 2006 年的調查，全國都原違建戶（約 500 戶）僅佔總戶數（7 萬 1,604 戶）的 0.7 %，顯見流浪到橋下的都原，在居大不易的都市裡，更是弱勢中的弱勢。