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A gantry (also known as a road sign holder, road sign structure) is a traffic sign assembly in which signs are mounted or are supported on an overhead support. Gantries are usually built on high-traffic roads or routes with several lanes, where signs posted on the side of the highway would be hard for drivers to see. Gantries may be cantilevered or one sided on the left, right and center (sometimes referred to as a half-gantry or Butterfly gantry), or they may be bridges with poles on each side.