Gantry (transport)

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.

In most jurisdictions in Canada, signs that are mounted on overhead gantries are installed perpendicular to the roadway.

In New Brunswick, the opposite is true: signs are angled slightly face-up to capture and reflect more sunlight towards the roadway.

The road signs are usually located on top and some have lights to indicate open or closed lanes.

They may also consist of variable-message signs, and more recently Active Traffic Management, to close lanes due to accidents and for other reasons.

Gantry signs are used frequently in the U.S., particularly in urban areas where freeways have an exit every mile to fit in with the grid system.