Retroreflectors are at present the only known means to extend the visibility of pedestrians at night to a safe level. This requires, however, that the retroreflectors have a certain optical quality and a reasonable life time.
In: Proceedings of the 20th Conference Session of the International Commission on Illumination CIE, Amsterdam, 31 August-8 September 1983, Volume 1, p. E14/1-2, 3 graph., 1 ref.
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