This study is based on fieldwork to find barriers created by imperfections in tactile ground surface indicators in London and Paris . Tomomi MIZUNO of Kinki University and Katsumi TOKUDA of University of Tsukuba conducted the fieldwork in March 2006 . We present examples of some tactile ground surface indicators that may expose visually handicapped persons to dange r or confuse them when they are walking. We also provide examples of tactile ground surface indicators that are improperly installed, along with photographs, so that this paper can be used for improving tactile ground surface indicators.