The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.

To search for another term please use  "Back to the list" to return to the main page or the e-ILV.

For the complete set of terms and definitions CIE S 017:2020 can be purchased from the CIE Webshop. Members of a CIE National Committee or Associate National Committee have access to a 66,7 % discount on the purchase price of the standard.

For advice on CIE Publications contact Note the CIE Helpdesk cannot assist with technical enquiries.


overall uniformity of road surface luminance


quotient of the minimum luminance at a point and the average road surface luminance over an evaluation area

Note 1 to entry: Where the luminance value refers only to the carriageway part of the road it can be known as "carriageway luminance".

Note 2 to entry: The overall uniformity of road surface luminance has unit one.

Note 3 to entry: This entry was numbered 17-857 in CIE S 017:2011.

Publication date: 2020-12
Copyright © CIE 2020. All Rights Reserverd.