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LEDs are proving their benefits in most outdoor area lighting applications, but the point sources integrated in solid-state lighting fixtures are an especially good match for tunnel applications. The words "dark" and "dingy" appropriately describe many highway tunnels around the world. So when you see a tunnel that is brightly illuminated, with no shadows or dark spots, you may wonder why all tunnels are not well lit. In fact, new installations in many parts of the world demonstrate that well-specified LED tunnel lighting helps a driver's eyes adjust easily and quickly, keeps disruptive maintenance to a minimum, and saves energy while improving light quality.