Abstract: In one embodiment, a design application is provided that utilizes layered analytical modeling in a design and analysis workflow. An analytical model may be described in a model file by a base geometry and a plurality of analysis parameters, including modification geometries that define changes that can be made to the base geometry, loading definitions that define how loads are evaluated, and appurtenances groups and configurations that define the nature and arrangement of appurtenances. A user may select analysis parameters which together with the base geometry define a scenario. A plurality of scenarios may be maintained within the same model file. When a particular scenario is to be visualized and analyzed, the analysis parameters of a scenario are layered on to (i.e. merged with) the base geometry.

Abstract: In one embodiment, a design application is provided that utilizes layered analytical modeling in a design and analysis workflow. An analytical model may be described in a model file by a base geometry and a plurality of analysis parameters, including modification geometries that define changes that can be made to the base geometry, loading definitions that define how loads are evaluated, and appurtenances groups and configurations that define the nature and arrangement of appurtenances. A user may select analysis parameters which together with the base geometry define a scenario. A plurality of scenarios may be maintained within the same model file. When a particular scenario is to be visualized and analyzed, the analysis parameters of a scenario are layered on to (i.e. merged with) the base geometry.

Abstract: A sliding sign is movably mounted on an overhead truss which extends over a roadway. The sliding sign is mounted on rails connected to the top and bottom chords of the truss so that the sign may be moved from a position over the roadway to a position adjacent the shoulder of the roadway so that necessary maintenance may be performed on the sign without the need for lane closures of the roadway.

Abstract: A support truss for a messaging sign comprising an elevated box truss which extends over a roadway and which has its opposite ends secured to upstanding supports. The box truss is comprised of a plurality of box truss sections secured to one another in an end-to-end relationship with at least one of the box truss sections adapted to have one or more messaging signs mounted therein. The messaging signs are horizontally slidably adjustably mounted on the box truss section so that the box truss section can accommodate signs having various thicknesses. The box truss in which the messaging sign is mounted is designed so that the face of the sign is unobstructed to permit motorists to readily observe the messages on the sign. A walkway is provided within the truss rearwardly of the messaging sign.