National Speed Limit Sign, Post Mounted Diagram 671 R2/RA2This national speed limit sign is post mounted and part of our wider range of permanent specification signage. The sign is constructed from a durable composite material that has no scrap value, great for deterring theft. A highly reflective Class 2 R2 grade material is applied onto the composite backing featuring the Diagram 671 design. This sign is normally installed on public roads to inform people of the correct speed limit in the area. In this