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| Type of road (permanent speed limit) |
Minimum siting distance of first sign in advance of the works |
Minimum clear visibility distance to first sign |
Minimum size of warning or regulatory sign (Note 1) |
Distance from end of works to "End of road works" signs |
|---|---|---|---|---|
| metres and miles | metres | mm | metres | |
| Single carriageway road (30 mph or less) |
20m—45m | 60 | 600 | 10—30 |
| Single carriageway road (40mph) |
45m—110m | 60 | 750 | 30—45 |
| Single carriageway road (50mph or more) |
275m—450m | 75 at 50mph 90 at 60mph |
900 | 30—45 |
| Dual carriageway road (40 mph or less) |
300m | 60 | 750 | 45 |
| Dual carriageway road (50 mph) |
Standard: 800m (1 mile where congestion is likely) Relaxation: 800m |
75 | 1200 | 90 |
| Dual carriageway road (60 mph) |
Standard:1 mile (2 miles where congestion is likely Relaxation: 1 mile |
90 | 1500 | 90 |
| Dual carriageway road (national speed limit) |
Standard: 2 miles (3 miles where congestion is likely) Relaxation: 1 mile |
120 | 1500 | 90 |
| Dual carriageway road (national speed limit) hard shoulder only closure |
800m | 120 | 1500 | 90 |
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