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Flashing Signals
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The most important thing to remember is that the failure of a device, such as a burned out bulb or a flasher that fails to flash, CANNOT cause a less restrictive aspect to be displayed. For instance a yellow over green whan the yellow burns out would display a clear instead of an approach medium. A light out relay is installed (by law) to transfer the yellow aspect to the bottom unit to give a less restrictive approach aspect.
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