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30 MPH Minimum Speed Limit Sign – Diagram 672. Permanent UK road sign enforcing a 30mph minimum speed. Ideal for tunnels and fast-flow zones. Complies with UK traffic standards.
Professional design, supply, and installation of all types of traffic signs across the UK.
Learn More 🚀The 30 MPH Minimum Speed Limit Sign – Diagram 672 is a UK regulatory sign used to indicate the minimum speed that vehicles must travel in a specific area. Featuring a white “30” on a solid blue circular background, this sign ensures traffic maintains a safe and consistent flow—especially in tunnels, high-speed lanes, or zones where excessively slow driving poses a hazard.
This sign is fully compliant with TSRGD Diagram 672 and referenced in Chapter 3 of the Traffic Signs Manual. It plays a critical safety role in managing vehicle behaviour in controlled environments where consistent speed is vital to traffic performance and safety.
Manufactured in RA1 (urban) and RA2 (high visibility) reflective materials, this sign is available in multiple sizes and produced using Zintec, GRP, composite board, 3mm or 5mm plastic, and self-adhesive vinyl. Mounting options include plate-only, riveted frame, quick-fit, and sticker installations.
Diagram 672 is used to enforce a minimum speed threshold in zones where slow-moving vehicles may cause danger or congestion. It’s typically found in tunnels, dedicated motorway lanes, low-speed enforcement zones, and certain high-capacity throughways.
✔️ Compliant with UK TSRGD and Chapter 3 standards
✔️ Clear white-on-blue design for instant recognition
✔️ Suitable for use in tunnels, high-speed roads, or managed lanes
✔️ RA1 & RA2 reflective materials for maximum visibility
✔️ Multiple sizes and substrates available
✔️ UK manufactured for quality and rapid dispatch
• Tunnel environments and underground roads
• Managed motorway lanes and expressways
• High-speed urban bypasses or dual carriageways
• Zones with active traffic control or congestion reduction
• Rail replacement or coach-specific lanes
• ✅ 30 MPH Minimum Speed Limit Sign – Diagram 672
• ✅ Ensures minimum traffic speed for flow and safety
• ✅ TSRGD-compliant with RA1 & RA2 reflectivity
• ✅ Durable and visible for permanent placement
• ✅ Ideal for tunnels, high-speed and managed lanes
| Feature | Details |
|---|---|
| Product Name | 30 MPH Minimum Speed Limit Sign |
| Diagram Number | 672 |
| 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 672, Chapter 3 |
| Section | Link & Description |
|---|---|
| 🛒 Shop Blue Minimum Speed Signs | Browse minimum speed and blue regulatory signs |
| 📏 Sizing Guide | See available sizes and options |
| 🧰 Mounting Information | Explore our installation and fixing systems |
| 📞 Request a Quote | Get a quote for Diagram 672 |
| 📚 TSRGD Regulations | 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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