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APPENDIX B
| Diagram No. |
Description | x-height or plate size (mm) appropriate to the triangle heights shown (see Appendix A) | ||||
|---|---|---|---|---|---|---|
| 6001 (mm) |
7501 (mm) |
900 (mm) |
12002 (mm) |
15003 (mm) | ||
| 817.2 | Escape lane ahead | 50*/62.5 | 75 | 100 | 125 | 125 |
| 950.1 | Child cycle tests | 50*/62.5 | 75 | 100 | – | – |
| 7009.1 | Skid risk and maximum advised speed of 20 mph |
50/62.5 | 75 | 100 | 125 | |
NOTES
- For the 600mm and 750 mm size triangles, the smaller x-height, where more than one is shown, is appropriate if the 85th percentile speed is 20 mph or less. Where a 50 mm x-height is marked with an asterisk, this is the standard size for 85th percentile speeds up to 30 mph.
- For the 1200 mm size triangle, the larger x-height, where more than one is shown, should be used on dual carriageway roads where the national speed limit applies or on single carriageway roads where greater emphasis is required.
- As a 1500 mm size sign is sometimes used in place of a 1200 mm sign (see note 2 of Appendix A), x-heights for supplementary plates used in these circumstances are quoted even though that particular sign may not be used on motorways or all-purpose dual carriageways with grade separated junctions. The larger x-height, where more than one is shown, should be used on dual carriageway roads where the national speed limit applies or on single carriageway roads where greater emphasis is required.
- The larger signs are intended for use on main roads when an arrow has been added to the plate indicating a humped pedestrian crossing in the minor road leading from the junction ahead.
- Although permitted by the Regulations, diagrams 530 and 530A are unlikely to be used with the supplementary plates to diagrams 572 and 573 (see section7).
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