Natural lighting of road pre-tunnels: A methodology to assess the luminance on the pavement - Part I
This two-part paper presents a comprehensive methodology for lighting calculation of a road pre-tunnel. The
adequate lighting of road tunnels, especially in their entrance zone during the day-time hours, is a very important
factor to maintain road safety and to ensure a good level of service. These targets are commonly achieved
by means of artificial lighting systems. In some cases, nevertheless, it could be preferable to build a pre-tunnel,
which reduce and control the natural lighting contribution, in the threshold zone of the tunnel. The structure, in