Abstract
As the design basis of the tunnel lighting system, tunnel access zone luminance (TAZL) directly affects the energy efficiency of the tunnel lighting system and the driving safety of drivers. Affected by the relative position of the sun, weather conditions and other factors, the TAZL dynamically changes over time, but the existing tunnel mostly uses a fixed luminance value for the design and operation of the tunnel lighting system, which lacks a simplified method to obtain the real-time luminance. In this study, the L20(S) (the average luminance observed by the driver at 20° field of view) at the tunnel stopping sight distance is split, and the sky luminance is calculated by using the sky luminance model. While a segmented prediction model of the ground scenery luminance is established with the maximum sun height angle as the inflection point, the solar irradiance outside the tunnel is adopted as the input parameter. This new proposed L20(S) evaluation model is verified within the error of 5.41%, which provides a convenient and accurate method for the real-time measurement of TAZL.
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