Counter-beam lighting (German: Gegenstrahlbeleuchtung) is a type of road lighting used mainly in road tunnels, providing best visibility of obstacles on the 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 adapts to new lighting conditions, which is especially impactful during sunshine and at high entry speeds.
Counter-beam lighting (German: Gegenstrahlbeleuchtung) is a type of road lighting used mainly in road tunnels, providing best visibility of obstacles on the 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 adapts to new lighting conditions, which is especially impactful during sunshine and at high entry speeds.
Source: Wikipedia "Counter-beam lighting" · CC BY-SA 4.0
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