Measuring Methods of Luminance Contrast between Tactile Walking Surface Indicators and Their Surrounding or Adjacent Surfaces at Railway Stations

摘要

The visual contrast between tactile walking surface indicators (TWSIs) and their surrounding or adjacent surfaces is important for people with low vision when they walk by themselves. Between two components of visual contrast, luminance contrast is recognized even by people with low vision who have color vision deficiency, so some existing guidelines and standards stipulate numerical criteria for luminance contrast. However, none of the existing guidelines and standards provide enough instructions for the practical measurement of the luminance contrast around TWSIs, which is necessary when applying numerical criteria in real environments such as railway stations. In this paper, the authors propose measuring methods of the luminance contrast around TWSIs, taking the environmental characteristics of railway stations into consideration.