Gantry/ˈɡæntri/ Definition 1 of 3Pro Tip 1/3Not Always Solid Gantry structures may be solid but can also be frameworks with open spaces. The overhead gantry on the road held electronic signs. Pro Tip 2/3Supportive Role Gantries often support other equipment and are not the main focus themselves. Flashing lights were attached to the side of the highway gantry. Pro Tip 3/3Height Matters Gantries are elevated structures ensuring visibility or functionality above ground. A new gantry was constructed to display traffic information.