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National Speed Limit Sign – Diagram 671. Permanent UK road sign indicating default national speed limits. Used to signal end of local restrictions on all classes of road.
Professional design, supply, and installation of all types of traffic signs across the UK.
Learn More 🚀The National Speed Limit Sign – Diagram 671 is one of the most iconic UK traffic signs, used to indicate the start of a national speed limit zone. Displayed as a white circle with a diagonal black stripe, this regulatory sign signals the end of a lower limit and the commencement of the national speed limit — 60mph for single carriageways and 70mph for dual carriageways and motorways, unless otherwise specified.
Compliant with TSRGD Diagram 671 and defined in Chapter 3 of the Traffic Signs Manual, this sign is essential for motorists transitioning from speed-restricted zones to national limits. It’s used extensively by local authorities, highway maintenance contractors, and developers managing road infrastructure.
Manufactured in RA1 and RA2 reflective grades, this sign is available in a full range of sizes and materials including Zintec, GRP, composite panels, 3mm and 5mm plastic, and self-adhesive vinyl. Installation options include plate-only, riveted in frame, quick-fit, and sticker mounts.
Diagram 671 is used throughout the UK to reinstate the default national speed limit for cars and light vehicles. Commonly found on rural exits, dual carriageways, and motorway slip roads, it plays a vital role in the country’s traffic control system by defining the legal speed limit boundaries.
✔️ Manufactured to UK TSRGD and Chapter 3 standards
✔️ Available in all sizes from 300mm to 1500mm
✔️ RA1 and RA2 options for day and night visibility
✔️ Ideal for councils, developers, and infrastructure projects
✔️ Fast UK production and nationwide dispatch
✔️ Durable materials designed for outdoor use in all weather
• National speed limit transition zones
• End of speed-restricted urban areas
• Entry to rural roads, dual carriageways, and motorways
• Highways maintenance and infrastructure schemes
• Enforcement of default UK speed regulations
• ✅ National Speed Limit Sign – Diagram 671
• ✅ Complies with TSRGD regulations for UK roads
• ✅ Reinforces default speed limits (60mph or 70mph)
• ✅ High-visibility, weatherproof materials
• ✅ Broad size and mounting range available
| Feature | Details |
|---|---|
| Product Name | National Speed Limit Sign |
| Diagram Number | 671 |
| Reflective Class (Facing) | RA1 (standard), RA2 (high visibility) |
| Mounting Options | Plate-only, Riveted Frame, Quick Fit, Self-Adhesive |
| Material (Substrate) | Zintec, GRP, Composite, 3mm Plastic, 5mm Plastic, Stickers |
| Available Sizes (mm) | 300, 450, 600, 750, 900, 1200, 1500 |
| Compliance | TSRGD Diagram 671, Chapter 3 |
| Section | Link & Description |
|---|---|
| 🛒 Shop Speed Limit Signs | Browse our permanent road sign range |
| 📏 Sizing Guide | See available sign sizes and formats |
| 🧰 Installation Options | View mounting solutions |
| 📞 Get a Quote | Request a custom quote for Diagram 671 |
| 📚 Regulations Manual | Traffic Signs Manual – GOV.UK |
| Weight | 4.9 kg |
|---|---|
| Facing | RA1, RA2, R3B |
| Substrate | Aluminium, Composite, Stickers |
| Fixing | Channel, Plate Only, Self-Adhesive |
| Size (mm) | 300, 600, 750, 900 |
| Facing Type | Warranty Duration |
|---|---|
| RA1 | 7 years |
| R2/RA2 | 10 years |
| R3B/R3C | 12 years |
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