Rinsho Ganka Volume 56, Issue 5 (May 2002)

Perception of road traffic lights using light-emitting diodes by congenitally color-defective persons Yoshiteru Nishio 1 , Kenji Kitahara 1 , Yuji Ikemura 2 , Mikio Sugimoto 3 , Shouichi Izawa 4 , Kunpei Itoh 4 , Muneyuki Kandabashi 4 1Dept of Ophthalmol, Jikei Univ Sch of Med 2Universal Traffic Management Society of Japan 3Traffic Bureau, National Police Agency, Government of Japan 4The Japanese Council of Traffic Science pp.753-757
Published Date 2002/5/15
DOI https://doi.org/10.11477/mf.1410909079
  • Abstract
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We evaluated the ability of congenitally color-defective persons in discriminating among red, yellow and green traffic lights using light-emitting diodes (LED). We built two traffic light systems. Incandescent light bulbs were housed in one and LEDs in the other. The two systems were presented to 5 normal persons and 18 color-defective persons as test subjects. The 5 persons with normal color vision gave correct answers regarding red, yellow and green. Out of 18 color-defective persons, 11 (61%) gave false answers both for LED and incandescent lights. The inci-dence of false answers was greater for red and yellow by LED than by incandescent lamp. The findings show that a ma-jority of color-defective persons have difficulties in distinguishing LED road traffic lights. There is an urgent need to incorporate additional signs in the traffic light system.

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56巻5号 (2002年5月)
電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院