Step 4#

Select panel stiffener type and number of supports (N) from Table B.1, based on the sign width. For modular sign panels, use only Type 2 stiffeners. For the stiffener design and number of posts required to suit the sign width, the wind region derived from Figure B.1 (Step 2) should be used as these values have been derived for Exposed Terrain Category 2 conditions.

Maximum sign widths are tabulated for three options of support spacing as discussed in Section 5.3.1.

Option 1 will be most frequently adopted for normal situations to minimise the number of supports.

Option 2 may be adopted where an additional support is required to satisfy the design figures or is used to achieve ‘frangible’ section size.

Option 3 caters for widely spaced supports (for example, straddling footpaths). Note that for signs of width less than the limiting values, support spacing may be reduced to less than the ‘standard’ spacing provided that the maximum stiffener overhang specified in Table B.2 is not exceeded.

Select the number of panel stiffeners from Table B.3. For modular sign panels, use three stiffeners (Type 2) at 580mm spacing per 1200mm high sign panel module.