Ecological traffic tunnel means that the manner can deal with tunnel project environmental problem of surrounding
area and it is most close to the green environment. In general, we always use artificial light sources, such as traditional
light sources and LED, to be the light source of illumination in the traffic tunnel. However, the best light source for the
health of the human body is the natural light. If we can guide the sunlight into the tunnel to be lighting source, it would
have a great benefit to the health of the human body. In this paper, we use Natural Light Guiding System to provide
ecological illumination in traffic tunnel. The system has collecting, transmitting, and lighting parts. In the collecting part,
we utilize a static concentrator to collect sunlight which is made up of a prismatic and cascadable unit. In the transmitting
part, the collected sunlight is guided by optical fiber or lightpipe efficiently. In the lighting part, we design a lighting
module of road lamp for lighting the inside the tunnel. The lighting module redistributes light to conform the traffic
regulation. Finally, we build a model of traffic tunnel in optical software with Natural Light Guiding System to simulate
the performance.
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