Abstract
IN his presidential address to the Junior Institution of Engineers delivered on December 14, Mr. C. C. Paterson chose as his subject “Modern Street Lighting”, laying stress on the necessity of making roads safe for traffic. It is important to remember that the number of licensed road vehicles in Great Britain has more than doubled during the last ten years. Even with the reduced maximum speed of 30 miles an hour in street lighted areas, good illumination is required for safe driving during night time. The great source of danger is that the eye has to function in conditions in which there is so little light. The eye sees by contrast either of colour or brightness. If everything were of the same colour and uniformly bright, and the visibility of the atmosphere were perfect, it would be impossible to distinguish objects from their backgrounds as there would be no contrast.
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