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| Recommended Letter Height for Effective Distance |
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| Letter Height | Effective Distance | Font Style | |
| 25mm | 3 metres | Block - Sans Serif | |
| 50mm | 4 metres | Block - Sans Serif | |
| 100mm | 6 metres | Block - Sans Serif | |
| 200mm | 50 metres | Block - Sans Serif | |
| 300mm | 300 metres | Block - Sans Serif | |
| 600mm | 1000 metres | Block - Sans Serif |