IEVref:845-31-144ID:
Language:enStatus: Standard
Term: surround ratio
Synonym1: SR, <in road lighting>
Synonym2:
Synonym3:
Symbol: Rs
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.


Publication date:2020-12
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