Abstract
In 2015, the Land Management Administration measured the road surface illuminance at threshold zone of the national road tunnels and found that 76% of the tunnels failed to meet the standard illuminance. For the request of the Ministry of Land, Infrastructure and Transport, the researchers selected 99 sites out of the 499 national road tunnels and investigated basic information to assess whether the tunnels meet the lighting standard by measuring the road surface luminance of the actual tunnels. Through investigation of lighting conditions and management methods, the problems of tunnels that are not meeting the standard were identified and classified according to the problem types, and improvement measures are proposed. The reflectance distributions of the road surface on the threshold zone and interior zone were measured to analyze the variation of road use, and the adequacy of the maintenance was analyzed through the measurement of the wall reflectance. In addition, the adequacy of the The Luminance to Illuminance Conversion Factor used in the tunnel lighting design was reviewed.
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