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Eagle Mark IV, cycling and flashing modes
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Low-Quality rendering of an Eagle Mark IV display. After several cycles the signals go into flash mode according to MUTCD guidelines. (Flash starts when the main street signal transitions from red to green) and comes out of flash mode also according to MUTCD guidelines (Start at main street green interval)
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Another place I see R/Y/Y is at firehouses. Once again, flashing yellow replaces green to indicate use caution around the firehouse.