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.
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entrance portal, <of a road tunnel>
part of a road tunnel construction that corresponds to the beginning of the covered part of the road tunnel or, when open sun screens are used, to the beginning of the sun screens
Note 1 to entry: This entry was numbered 17-387 in CIE S 017:2011.