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Overall post length = Sign height (H) + Mounting height + Planting depth
Note : Planting depth = Foundation depth (D) + Cover (usually 150mm)
The post diameter is dependent upon it's geograghical location, the mounting height and the sign plate area.
The tables below give the maximum recommended sign plate area for given post diameters with foundation details (for guidance only).
| Post diameter (mm) |
Less than 5km from shoreline | 5 km or more from shoreline | |||||
| Mounting height (mm) | 1500 | 2100 | 2300 | 1500 | 2100 | 2300 | |
| 76 | Maximum plate area (sq. m) | 0.86 | 0.65 | 0.60 | 0.95 | 0.72 | 0.66 |
| Foundation width (W) (mm) | 900 | 900 | 900 | 900 | 900 | 900 | |
| Foundation length (L) (mm) | 900 | 900 | 900 | 900 | 900 | 900 | |
| Foundation depth (D) (mm) | 700 | 600 | 600 | 700 | 600 | 600 | |
| 89 | Maximum plate area (sq. m) | 1.10 | 0.86 | 0.79 | 1.21 | 0.92 | 0.87 |
| Foundation width (W) (mm) | 1000 | 1000 | 1000 | 1000 | 1000 | 1000 | |
| Foundation length (L) (mm) | 1000 | 1000 | 1000 | 1000 | 1000 | 1000 | |
| Foundation depth (D) (mm) | 700 | 700 | 700 | 700 | 700 | 700 | |
| Post diameter (mm) |
Less than 5km from shoreline | 5 km or more from shoreline | |||||
| Mounting height (mm) | 1500 | 2100 | 2300 | 1500 | 2100 | 2300 | |
| 76 | Maximum plate area (sq. m) | 0.74 | 0.56 | 0.50 | 0.78 | 0.60 | 0.55 |
| Foundation width (W) (mm) | 900 | 900 | 900 | 900 | 900 | 900 | |
| Foundation length (L) (mm) | 900 | 900 | 900 | 900 | 900 | 900 | |
| Foundation depth (D) (mm) | 700 | 600 | 600 | 700 | 600 | 600 | |
| 89 | Maximum plate area (sq. m) | 0.95 | 0.73 | 0.66 | 1.02 | 0.79 | 0.73 |
| Foundation width (W) (mm) | 1000 | 1000 | 1000 | 1000 | 1000 | 1000 | |
| Foundation length (L) (mm) | 1000 | 1000 | 1000 | 1000 | 1000 | 1000 | |
| Foundation depth (D) (mm) | 700 | 700 | 700 | 700 | 700 | 700 | |
| Post diameter (mm) |
Less than 5km from shoreline | 5 km or more from shoreline | |||||
| Mounting height (mm) | 1500 | 2100 | 2300 | 1500 | 2100 | 2300 | |
| 76 | Maximum plate area (sq. m) | 0.64 | 0.47 | 0.44 | 0.68 | 0.51 | 0.47 |
| Foundation width (W) (mm) | 900 | 900 | 900 | 900 | 900 | 900 | |
| Foundation length (L) (mm) | 900 | 900 | 900 | 900 | 900 | 900 | |
| Foundation depth (D) (mm) | 600 | 600 | 600 | 700 | 700 | 700 | |
| 89 | Maximum plate area (sq. m) | 0.83 | 0.64 | 0.58 | 0.87 | 0.68 | 0.62 |
| Foundation width (W) (mm) | 900 | 1000 | 1000 | 1000 | 1000 | 1000 | |
| Foundation length (L) (mm) | 900 | 1000 | 1000 | 1000 | 1000 | 1000 | |
| Foundation depth (D) (mm) | 700 | 600 | 600 | 700 | 700 | 700 | |
| Post diameter (mm) |
Less than 5km from shoreline | 5 km or more from shoreline | |||||
| Mounting height (mm) | 1500 | 2100 | 2300 | 1500 | 2100 | 2300 | |
| 76 | Maximum plate area (sq. m) | 0.61 | 0.45 | 0.40 | 0.61 | 0.45 | 0.40 |
| Foundation width (W) (mm) | 900 | 900 | 900 | 900 | 900 | 900 | |
| Foundation length (L) (mm) | 900 | 900 | 900 | 900 | 900 | 900 | |
| Foundation depth (D) (mm) | 600 | 600 | 600 | 600 | 600 | 600 | |
| 89 | Maximum plate area (sq. m) | 0.78 | 0.60 | 0.54 | 0.78 | 0.60 | 0.54 |
| Foundation width (W) (mm) | 900 | 1000 | 1000 | 900 | 1000 | 1000 | |
| Foundation length (L) (mm) | 900 | 1000 | 1000 | 900 | 1000 | 1000 | |
| Foundation depth (D) (mm) | 700 | 600 | 600 | 700 | 600 | 600 | |
| Height of triangle / Diameter of circle (mm) | Triangular area (sq. m) | Circular area (sq. m) |
|||
| 300 | - | 0.07 | |||
| 450 | - | 0.16 | |||
| 600 | 0.21 | 0.28 | |||
| 750 | 0.32 | 0.44 | |||
| 900 | 0.47 | 0.64 | |||
| 1200 | 0.83 | 1.13 | |||
| 1500 | 1.30 | 1.77 |