521 two way traffic sign face for the end of a dual carriageway
Diagram 521 warns drivers that the road ahead changes from a dual carriageway to a single carriageway carrying two-way traffic. It is placed after the end of dual carriageway sign, as close as possible to the start of the two-way section, and can be paired with a distance plate such as diagram 570 or 572. The sign face is manufactured to BS EN 12899-1:2007 and UK highway regulations, CE marked, with a Class 2 RA2 high-intensity reflective surface for night-time visibility.
Key features
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Road-legal spec - manufactured to BS EN 12899-1:2007 and CE marked, the requirement for permanent signs on public highways.
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Class 2 RA2 reflective face - high-intensity reflectivity keeps the sign visible to drivers in low light.
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Weatherproof build - 3mm aluminium composite face with a grey rear, made for permanent outdoor use.
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Post or wall mounted - rear channels for post fixing, or an undrilled face ready for wall fixing.
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Three sizes - 450mm, 600mm and 750mm to suit the road and viewing distance.
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Made in the UK.
Where it is used
- Ends of dual carriageways changing to two-way traffic
- Public highways and local authority road networks
- Private roads and estate networks
- Traffic management and streetworks schemes
Placement
Place the 521 sign after the end of dual carriageway sign and as close as possible to the point where two-way traffic begins. Where the two-way section runs for a set length, it can be paired with a distance plate - diagram 572 (distance ahead) or diagram 570 (for distance) - so drivers know how long the layout lasts.
Mounting options
The post mounted option comes with rear channels that clamp to the post using anti-rotational clips, holding the face firmly so it cannot twist. This product is the sign face only - 76mm posts and clips are sold separately, with two clips needed per sign. The wall mounted option is supplied without holes; drill the aluminium composite for screw fixing or bond it to the wall with a no-nails adhesive.
Specification
| Specification |
Detail |
| Diagram reference |
521 |
| Sign sizes |
450mm, 600mm or 750mm |
| Face thickness |
3mm |
| Material |
Aluminium composite |
| Face colour |
Red, white and black |
| Rear colour |
Grey |
| Reflectivity |
Class 2 RA2 (R2) |
| Compliance |
BS EN 12899-1:2007, CE marked |
| Mounting |
Wall mounted or post mounted with rear channels |
| Lead time |
7-10 working days |
| Origin |
Made in the UK |