Step 5#

Select the support (size and type) from Figure B.2-13 for the appropriate Region A, B, C or D and sign area. For exposed locations (unshielded Terrain Category 2 in AS/NZS 1170.2) prone to high wind or where support collapse is more hazardous than normal situations, a Wind Region one step up from that derived from Figure B.1 (Step 2) should be used (only for post design) for example, use Region C design charts for Exposed Region B. If no choice of support size is possible for the number of supports ‘N’ chosen in Step 4, then add an extra support to ‘N’ and choose a support size again from Figure B.2-13 – refer to discussion in Section 5 of the text on the criteria for selection of support type (CHS post, RHS post), for example, requirement for breakaway supports, corrosion protection, erection, structural efficiency, cost, aesthetics.

For breakaway supports, note the limitation on sign panel height relative to sign ground clearance height. For signs supported by CHS / RHS posts, with sign panel height ‘B’ greater than 1.65 x clearance ‘H’, increase the post size as indicated on Figure B.2-13.