Universal design for road signs in color Kaoru Nakamura 1 , Osamu Okajima 2 , Yoshiteru Nishio 3 , Kenji Kitahara 3 , Seiichi Onobori 4 , Yukinori Matsusita 5 , Shinichi Gunki 6 1Dept of Ophthalmol,Tokyo Women's Med Univ 2Dept of Ophthalmol,Sanraku Hosp 3Dept of Ophthalmol,Jikei Univ,Sch of Med 4Dept of Design,Industrial Design Course,Tokyo National Univ of Fine Arts and Music 5Facilities Planning Division,Office of Facilities Development,Japan Highway Pub Co 6Facilities Maintenance Division,Office of Facilities Development,Japan Highway Pub Co pp.523-527
Published Date 2005/4/15
DOI https://doi.org/10.11477/mf.1410100494
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 Purpose:To report the outcome of experiments regarding color display in red for road informations. Cases and Method:A total of 21 adults participated in the study,comprising 5 protanopes,6 deuteranopes,and 10 persons with normal color vision. All had corrected visual acuity of 0.7 or over. They were shown light emitting diode luminescence(LED)ranging from 590 nm to 640 nm. Color defective persons were asked as to easiness of recognition. Color normals were asked to tell their subjective sensation as red. Results:The wavelength of 640 nm was the hardest to be recognized by color defective persons. Wavelength of 620 nm was most easily legible by them. Color normals responded more red-like sensation along with longer wavelength. The most approriate wavelengths for both color defectives and color normals appeared to be 627 nm during daytime and 624 nm at nighttime. Conclusion:There is an urgent need for color universal design for road display in color that satisfy the requirements of color normals and color defective persons.

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