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 helpdesk@cie.co.at. Note the CIE Helpdesk cannot assist with technical enquiries.
threshold zone, <of a road tunnel>
first part of a road tunnel, directly after the entrance portal
Note 1 to entry: The threshold zone starts either at the beginning of the road tunnel or at the beginning of the sun screen when a sun screen is installed. The length of the threshold zone is at least equal to the stopping distance.
Note 2 to entry: This entry was numbered 17-1314 in CIE S 017:2011.