20 MPH Speed Limit Sign – Diagram 670-A | Permanent UK Traffic Sign
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20 MPH Speed Limit Sign – Diagram 670-A. Mandatory UK traffic sign for enforcing a 20mph limit. Complies with TSRGD, ideal for roads near schools, housing, or high footfall areas.
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20 MPH Speed Limit Sign – Diagram 670-A | Permanent UK Traffic Sign
The 20 MPH Speed Limit Sign – Diagram 670-A is a mandatory UK road sign used to indicate a maximum speed limit of 20 miles per hour. Recognisable by its red circular border and bold black numerals, it plays a vital role in slowing traffic in residential areas, near schools, and on roads with higher pedestrian activity.
This sign is fully compliant with TSRGD Diagram 670-A and is specified in the Traffic Signs Manual, Chapter 3. As a permanent regulatory sign, it helps enforce safer road behaviour and reduce accident rates, especially in urban, built-up, and high-footfall zones.
Manufactured with RA1 and RA2 reflective face materials, the 20 MPH sign is available in a variety of sizes and substrates, including Zintec, GRP, composite panels, 3mm or 5mm plastic, and self-adhesive vinyl for internal applications. It can be supplied as plate-only, riveted in a frame, quick-fit, or as a sticker depending on installation needs.
???? Technical Review
Diagram 670-A is used across the UK to legally enforce speed limits in sensitive traffic zones such as town centres, school perimeters, hospital roads, or shared-space neighbourhoods. With increased government focus on 20mph zones in urban areas, this sign is essential for public safety and legal compliance.
✅ Why Choose Morelock for Your Diagram 670-A Sign?
✔️ Fully compliant with UK TSRGD regulations
✔️ High-visibility reflective RA1/RA2 options
✔️ Tough, weatherproof substrates for long-term use
✔️ Available in multiple sizes and mounting styles
✔️ UK-manufactured with fast delivery options
✔️ Suitable for councils, schools, developers, and contractors
???? Ideal For:
• Urban and suburban traffic zones
• Residential streets and school zones
• Housing developments or 20mph pilot schemes
• Traffic calming schemes or pedestrian-heavy areas
• Local authority and contractor installation
???? Summary (Why You Should Buy This Product)
• ✅ 20 MPH Speed Limit Sign – Diagram 670-A
• ✅ Mandatory sign for enforcing speed zones
• ✅ TSRGD & Chapter 3 compliant
• ✅ Multiple size, material, and mounting choices
• ✅ Suitable for any UK permanent traffic calming scheme
???? Product Specifications Table
| Feature | Details |
|---|---|
| Product Name | 20 MPH Speed Limit Sign |
| Diagram Number | 670-A |
| Reflective Class (Facing) | RA1 (urban), RA2 (higher 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-A, Chapter 3 |
???? Additional Useful Links
| Section | Link & Description |
|---|---|
| ???? Shop Speed Limit Signs | Explore our full range of speed restriction signs |
| ???? Sizing Guide | Compare all available sizes |
| ???? Installation Options | See our mounting systems |
| ???? Get a Quote | Get pricing for Diagram 670-A signs |
| ???? TSRGD Guidance | Read the Traffic Signs Manual |
| Weight | 4.9 kg |
|---|---|
| Facing | RA1, RA2, R3B |
| Substrate | Aluminium, Composite, Stickers |
| Fixing | Channel, Plate Only, Self-Adhesive |
| Size (mm) | 300, 600, 750, 900 |