Abstract
RECENTLY attention has been directed to the number of accidents caused by mechanically propelled vehicles. The use of coloured signals may lead to difficulties for drivers with defective colour vision. Until the colour vision of persons who seem to disregard the coloured lights is tested, we do not know to what extent coloured lights constitute a difficulty to motor drivers with defective colour vision. In any case the remedy is simple, as a difference in shape of the coloured lights would be sufficient to prevent mistakes. It is true that the relative positions of the lights and other data may help in the recognition of the colour, so that the problem is not so serious as in the case of railway and marine services.
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ROAF, H. Normal and Abnormal Colour Vision*. Nature 134, 442–445 (1934). https://doi.org/10.1038/134442a0
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DOI: https://doi.org/10.1038/134442a0