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The purpose of this paper is to present a relative evaluation method of shpperiness of flat and inclined floors and pavements 丘om a vieWpoint of straight mob 血 ty of wheelchairs ． F 廿 st ， sご ales of the mobility were made by sensory test in which a wheelchair was used to ruh on l va 加 us samples ． Then ， shp − resistance values of samples were measured respectively with a ' apparatus developed by author8 in 』 f｛〕rmer research ， ． an evaluation index was proposed ' o cOrrespoAd to scales ． Consequently ， the relative evaluation method of slipperiness of 且at and inclined floors and pavements from the Viewpoint of straight mobility of wheelchairs was presented ． 麁 郷 慵 rwheelehair ， strAigbt rnobifity ． relativ θ evalution method ． slip ρ en '