Counter-beam Lighting
Counter-beam lighting (German: Gegenstrahlbeleuchtung) is a type of road lighting used mainly in road tunnels, providing best visibility of obstacles on the Highway, lane, and thus traffic safety, while reducing light-energy cost. It is mostly installed at road tunnel entrances (transition zone) to counteract the few seconds of lower visibility while the eye Adaptation (eye), adapts to new lighting conditions, which is especially impactful during sunshine and at high entry speeds. With conventional lighting technology, very high luminances with correspondingly high energy costs would have to be provided in these areas to make obstacles on the roadway sufficiently visible. Principle of counter-beam lighting The light from the lamps does not shine perpendicularly down onto the roadway, but is angled towards oncoming vehicles. With a carefully chosen angle of inclination and suitable Street light, lighting fixtures, visibility is improved without dazzling the driver. The roadway a ...
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