The function of motorway gantries is defined as a load-bearing steel frame structure that performs the primary function of the supporting part for information and signalling boards on traffic roads. These portal constructions are available in several designs and always according to the information needs respectively. signalling board or device. Care is taken to ensure that all requirements are met, from maintenance to the service approach to installation and installation respectively. dismantling of information boards. According to the shape we know L,T,U portals L and T type portals are usually mounted on the edge respectively. into the lane divisions of the highway, the U-portal is a frame that runs across all four lanes of the highway and is usually walkable at the top, which means that there is a walkable section of gravel in the horizontal section for maintenance access. Ladders on the vertical parts of the portals are a matter of course.