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This publication gives explanatory comments on the Dutch standard NEN 3322 "Road traffic control light signals. Photometric requirements and test methods", published in December 1972. After a general introduction in chapter 1, chapter 2 deals with the fundamental aspects that were used as a basis when drawing up the requirements for chromaticity coordinates, luminous intensities and luminous intensity distributions, the limitation of the phantom effect, and optical systems presenting a symbolic appearance e.g. green-red arrows and crosses, pedestrians and bicycles. In chapter 3 some aspects are discussed of the locating and directioning of light signals. Some aspects of the construction and maintenance of light signals are discussed in chapter 4. Finally, chapter 5 deals with the test methods of light signals for luminous intensities, limitation of the phantom effect and the colours of the signals.