Sequenced gates are slightly different than dual, or interlocked gates. When two gate operators are connected as sequenced gates, a faster “Traffic Control Gate” operator (i.e. barrier arm or crash wedge) and a slower “Security Gate” operator (slide, swing, or vertical lift gate) operate in sequence to help prevent tailgating by unauthorized vehicles. Both operators open (Security Gate first followed by the Traffic Control Gate) and allow a vehicle through, but the faster moving Traffic Control Gate closes quickly once its reset/center loop and all obstruction loops are cleared. Upon reaching its closed limit, the Traffic Control Gate signals the Security Gate to close.
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