# Traffic Signs Manual/Chapter 4/2013/B

SIZES OF SUPPLEMENTARY PLATES
| Diagram No. | Description | x-height or plate size (mm) appropriate to the triangle heights shown (see Appendix A) | x-height or plate size (mm) appropriate to the triangle heights shown (see Appendix A) | x-height or plate size (mm) appropriate to the triangle heights shown (see Appendix A) | x-height or plate size (mm) appropriate to the triangle heights shown (see Appendix A) | x-height or plate size (mm) appropriate to the triangle heights shown (see Appendix A) |
| Diagram No. | Description | 600$^1$ (mm) | 750$^1$ (mm) | 900 (mm) | 1200$^2$ (mm) | 1500$^3$ (mm) |
| 502 | STOP 'x' yds | 62.5 | 75 | 100 | 125 | – |
| 503 | GIVE WAY 'x' yds | 62.5 | 75 | 100 | 125 | – |
| 511 | REDUCE SPEED NOW | 62.5 | 75 | 100 | 125/150 | 200 |
| 513.1 | Adverse camber | 50/62.5 | 75 | 100 | 125 | 150 |
| 513.2 | Maximum speed advised | 50*/62.5 | 75 | 100 | 125 | – |
| 518 | Single file traffic | 50/62.5 | 75 | 100 | 125 | 150 |
| 519 | Single track road | 50/62.5 | 75 | 100 | – | – |
| 525 | Low gear now | 50/62.5 | 75 | 100 | 125 | 150 |
| 526 | Keep in low gear | 50/62.5 | 75 | 100 | 125 | 150 |
| 527 | Low gear for 'x' miles | 50/62.5 | 75 | 100 | 125 | 150 |
| 530.1 | Overhanging building (when used with diagram 530) | 50*/62.5 | 75 | 100 | – | – |
| 530.1 | Overhanging building (when used with diagram 530A) | 50*/62.5 | 75 | 100 | – | – |
| 531.2 | ARCH BRIDGE High vehicles use middle of road | – | 75 | 100 | 125/150 | – |
| 543.1 | Part time signals | 50/62.5 | 75 | 100 | 125 | 150 |
| 546 | School | 50/62.5 | 75 | 100 | 125/150 | – |
| 547.1 | Patrol | 62.5/75 | 100 | 125 | 150 | – |
| 547.2 | Playground | 50/62.5 | 75 | 100 | 125/150 | – |
| 547.3 | No footway for 'x' yds | 50/62.5 | 75 | 100 | 125/150 | – |
| 547.4 | Disabled people | 50/62.5 | 75 | 100 | 125/150 | – |
| 547.7 | Disabled children | 50/62.5 | 75 | 100 | 125/150 | – |
| 547.84 | Humped crossing | 50/62.5 | 75 | 100 | 125 | – |
| 548.1 | When lights show 'x' yds | 50/62.5 | 75 | 100 | 125 | 150 |
| 553 | Horse-drawn vehicles and animals | 50*/62.5 | 75 | 100 | – | – |
| 553.2 | Farm traffic | 50/62.5 | 75 | 100 | 125/150 | 150 |
| 554.3 | Ice | 62.5/75 | 100 | 125 | 150 | 200 |
| 554.3 | Snowdrifts | 62.5 | 75 | 100 | 125 | 150 |
| 556.2 | Soft verges for 'x' miles | 50*/62.5 | 75 | 100 | 125 | 150 ​ |
| 557.2 | Humps for 'X' miles | 50 | – | – | – | – |
| 557.3 | Humps for 'x' yards in the direction indicated | 50*/62.5 | 75 | 100 | 125 | – |
| 557.4 | Hump x yards in the direction indicated | 50*/62-5 | 75 | 100 | 125 | – |
| 558.2 | Gliders | 50/62.5 | 75 | 100 | 125/150 | 150 |
| 563 | Accident | 62.5 | 75 | 100 | 125/150 | 200 |
| 563.1 | FIRE STATION STOP when lights show (X- ht of lower case legend) | 62.5 | 75 | 100 | 100 | – |
| 570 | For 'X' miles | 50/62.5 | 75 | 100 | 125/150 | 200 |
| 572* | 'X' yds (when used with diagram 530A or 531.1) | – | 50/62.5 | 75 | 100 | 125/150 |
| 572* | X yds (when used with other warning signs) | 50/62.5 | 75 | 100 | 125/150 | 200 |
| 573* | Distance and direction to hazard (when used with diagram 530A or 531.1) | – | 50/62.5 | 75 | 100 | 125/150 |
| 573* | Distance and direction to hazard (when used with other warning signs) | 50/625 | 75 | 100 | 125/150 | 200 |
| 575 | On coming vehicles in middle of road | 50/62.5 | 75 | 100 | 125 | 150 |
| 583.1 | Slow lorries for 'X' miles | 50/62.5 | 75 | 100 | 125/150 | 200 |
| 584.1 | Queues likely | 50/62.5 | 75 | 100 | 125/150 | 200 |
| 773 | STOP when lights show (X-height of lower case legend) | 62.5 | 75 | 100 | 125 | – |
| 778 | Train symbol (plate size) | 440 × 420 | 550 × 525 | 660 × 630 | 660 × 630 | – |
| 778.1 | Tram symbol ( plate size) | 480 × 300 | 600 × 375 | 720 × 450 | 720 × 450 | – |
| 780A | Safe height | 50/62.5 | 75 | 100 | 125 | – |
| 780.1A | Safe height at distance and in direction indicated | 50/62.5 | 75 | 100 | 125 | – |
| 780.2A | Safe height and load gauge | 50/62-5 | 75 | 100 | 125 | – ​ |
| 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).