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tunneli kohanemispiirkonna valgustus, mis võimaldab sõidukijuhil näha tunnelisse lähenemispiirkonnas viibimise ajal, lighting of the threshold zone of the tunnel which allows drivers to see into the tunnel whilst in the accesszone
threshold zone lighting . Valgustehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//valgus/threshold%20zone%20lighting/1/eng (02.07.2026)
