Aviation obstruction lights are lighting devices attached to tall structures: buildings, wind turbines, bridges etc. and used as collision avoidance measures. Such devices make the structure much more visible to passing aircrafts and is usually used at night, although in some countries they are used in the daytime also. Basically obstruction lights typically comes in various intensities (low, medium, high) and either fixed or flashing.http://www.shflylight.com/avia....tion-obstruction-lig
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