| 摘要 |
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.
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