Recognition of road traffic signals by persons with normal and defective vision

Normal and colour defective observers identified 13 colours as either red, green or amber. Each colour was presented 16 times under 2 levels of surround luminance. The colours were representative of the chromaticity boundaries established by the Commission International de l'Eclairage (CIE) and by the national standards asa d 10- 1: 1958, and bs 1376- 1953. Errors and choice reaction times were measured. Analysis of reaction times is presented. Analysis of error scores is not yet complete. The surround luminances used did not affect reaction times. Choice reaction time findings are found to be consistent with theoretical prediction from known facts concerning defective colour vision (a).