| Definition: | average illuminance on strips, which are adjacent to the edges of both sides of the carriageway, to the average illuminance on the adjacent strips in the carriageway Note 1 to entry: Specific requirements regarding the width of the strips are defined in CIE 140, Road Lighting Calculations. Note 2 to entry: The surround ratio has unit one. Note 3 to entry: This note applies to the French language only.
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