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Road Narrows on Right Ahead Warning Sign – Diagram 517-B. Warns drivers of a narrowing carriageway on the right side. Available in multiple sizes and reflective options.
Professional design, supply, and installation of all types of traffic signs across the UK.
Learn More 🚀The Road Narrows on Right Ahead Warning Sign – Diagram 517-B is a permanent UK traffic warning sign designed to alert drivers that the carriageway narrows from the right-hand side. Ideal for roads with narrowing shoulders, construction zones, or lane realignment, this sign helps improve safety by encouraging caution, lane discipline, and reduced speed.
Fully compliant with TSRGD Diagram 517-B, BS EN 12899-1, and Chapter 4 of the Traffic Signs Manual, this warning sign is made using aluminium or composite substrates, and features high-performance RA2 or R3B reflective sheeting for superior visibility day and night.
It is available in the full range of UK standard triangular sizes: 450mm, 600mm, 750mm, 900mm, 1200mm, and 1500mm. Installation options include channel fixings, plate-only, or self-adhesive backing, making it suitable for permanent and temporary traffic management.
This red-bordered triangular sign features two black vertical lines, with the right line curving inward to indicate narrowing. The clean, intuitive layout helps motorists quickly recognise the hazard ahead and adjust their driving accordingly.
✔️ Official TSRGD-compliant traffic sign,
✔️ High-visibility RA2 or R3B reflective finish,
✔️ Aluminium, composite, or sticker format available,
✔️ Six sizes: 450mm, 600mm, 750mm, 900mm, 1200mm, 1500mm,
✔️ Installation-ready with multiple fixing options,
✔️ Fast UK-wide delivery direct from manufacturer,
• Roads narrowing from the right side,
• Lane closures on rural or city roads,
• Highway and street maintenance zones,
• Temporary or permanent traffic changes,
• Local authority and contractor use,
• ✅ Official UK road sign for right-side narrowing,
• ✅ Diagram 517-B compliant and fully reflective,
• ✅ Six size options for any setting,
• ✅ Weather-resistant, long-lasting materials,
• ✅ Free UK delivery from a trusted manufacturer
| Feature | Details |
|---|---|
| Product Name | Road Narrows on Right Ahead Warning Sign |
| Diagram Number | 517-B |
| Reflective Class (Facing) | RA2, R3B |
| Mounting Options | Channel, Plate-only, Self-Adhesive |
| Material (Substrate) | Aluminium, Composite, Stickers |
| Available Sizes (mm) | 450, 600, 750, 900, 1200, 1500 |
| Compliance | TSRGD Diagram 517-B, BS EN 12899-1, Chapter 8 |
| Section | Link & Description |
|---|---|
| 🛒 Shop Permanent Signs | Explore all Chapter 8 compliant road signs – reflective and compliant |
| 📏 Standard Triangle Sign Sizes | Choose from 450mm, 600mm, 750mm, 900mm, 1200mm & 1500mm – fast delivery |
| 🚧 Permanent Installation Options | Mounting posts, fixings, and installation services across the UK |
| 📞 Get a Road Sign Quote | Request pricing for bulk orders or custom specifications |
| 📚 Government Guidance | Safety at Street Works – Official Code of Practice (PDF) The Highway Code – UK traffic signage rules and standards |
| Weight | 3.9 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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