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Tunnel lights
Standards of tunnel lights installation are tunnel’s section, accessing road’s section, length of the tunnel, constructional finishing of the tunnel, existence of ventilating system, traffic amount, linear (curves or straights), sorts of surface, visibility range of entrance, outdoor brightness at the vicinity of entrance and exit from the driver’s sight and etc. In daylight sudden change from light adaptation to dark adaptation occurs so as it takes a little bit of time to identify the obstacles in the tunnel, lights are used in connection with the lighting inside the tunnel by gradually decreasing the luminance divided into boundary, transition, and relaxation sections.
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