40 MPH Speed Limit Sign – Diagram 670-C | Permanent UK Traffic Sign
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40 MPH Speed Limit Sign – Diagram 670-C. UK regulatory sign enforcing 40mph limit on roads. Ideal for transitional zones, rural areas, or light industrial roads. TSRGD-compliant.
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40 MPH Speed Limit Sign – Diagram 670-C | Permanent UK Traffic Sign
The 40 MPH Speed Limit Sign – Diagram 670-C is a mandatory UK road sign used to enforce a legal maximum speed limit of 40 miles per hour. Displayed as a bold black “40” within a red-bordered circle, this sign is highly recognisable and vital for maintaining safe driving conditions on single carriageways, village approaches, or transitional speed zones.
Compliant with TSRGD Diagram 670-C and detailed in Chapter 3 of the Traffic Signs Manual, the 40mph sign is ideal for roads where reducing speed improves safety without restricting traffic flow entirely. It’s a key part of local authority road strategies and developer-led infrastructure projects.
Available in RA1 and RA2 reflective grades, the sign is produced in multiple sizes using Zintec, GRP, composite, 3mm or 5mm plastic, or self-adhesive vinyl. Installation styles include plate-only, riveted frame, quick-fit, or sticker applications.
🔧 Technical Review
Diagram 670-C is an essential regulatory sign across UK roads for clearly enforcing 40mph speed restrictions. It is frequently deployed on rural-urban transition zones, B-roads, or minor A-roads where traffic needs calming but full residential restrictions are not necessary.
✅ Why Choose Morelock for Your Diagram 670-C Sign?
✔️ UK-made, rapid turnaround from manufacturer
✔️ Fully compliant with TSRGD and Chapter 3
✔️ Ideal for transitional speed zones and entry points
✔️ RA1 and RA2 reflectivity for full visibility
✔️ Wide range of sizes and materials available
✔️ Compatible with multiple mounting solutions
📌 Ideal For:
• Transitional speed zones (50 to 40 / 60 to 40)
• Minor A-roads and village entryways
• Industrial and commercial site perimeters
• Local council speed calming measures
• Infrastructure or developer-led traffic schemes
🌟 Summary (Why You Should Buy This Product)
• ✅ 40 MPH Speed Limit Sign – Diagram 670-C
• ✅ Standard UK road sign for 40mph enforcement
• ✅ Available in 7 sizes with RA1 or RA2 options
• ✅ Suitable for towns, rural zones, and development areas
• ✅ Durable materials and UK manufactured
📊 Product Specifications Table
| Feature | Details |
|---|---|
| Product Name | 40 MPH Speed Limit Sign |
| Diagram Number | 670-C |
| Reflective Class (Facing) | RA1 (urban), 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 670-C, Chapter 3 |
🔗 Additional Useful Links
| Section | Link & Description |
|---|---|
| 🛒 Shop Speed Limit Signs | Browse permanent UK speed restriction signs |
| 📏 Sizing Guide | View standard sign sizes |
| 🧰 Mounting Systems | Explore mounting & installation options |
| 📞 Request a Quote | Get pricing for 670-C or other signs |
| 📚 Guidance | 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 |