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Road Narrows on Left Ahead Sign – Diagram 517A. Warns drivers of a narrowing carriageway on the left 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 Left Ahead Sign – Diagram 517A is a permanent UK traffic warning sign used to inform drivers that the width of the carriageway will narrow from the left-hand side. This sign helps alert motorists to adjust their speed, road position, and awareness in advance of potential pinch points — especially useful on rural lanes, construction zones, or areas with lane closures.
Manufactured in full compliance with TSRGD Diagram 517A, BS EN 12899-1, and Chapter 4 of the Traffic Signs Manual, this sign is made using aluminium or composite substrates, and finished with high-performance RA2 or R3B reflective sheeting for maximum visibility in low light, fog, or nighttime conditions.
Available in six standard UK triangle sizes — 450mm, 600mm, 750mm, 900mm, 1200mm, and 1500mm — with installation options including channel fixings, plate-only, and self-adhesive systems, it’s ideal for both permanent installations and temporary deployments.
The design features a red-bordered triangle containing two black vertical lines — the left line bends inward to indicate the narrowing, while the right line remains straight. The visual layout provides immediate recognition of left-side road narrowing to help drivers react safely.
✔️ Compliant with TSRGD, Chapter 8, and BS EN 12899-1,
✔️ RA2 or R3B reflective sheeting for day/night clarity,
✔️ Durable aluminium or composite construction,
✔️ Sizes: 450mm, 600mm, 750mm, 900mm, 1200mm, 1500mm,
✔️ Mounting: Channel fixings, plate-only, or self-adhesive,
✔️ Manufactured in the UK and dispatched quickly with free delivery,
• Roads narrowing from the left-hand side,
• Construction zones with lane reductions,
• Local authority street works and rural lane safety,
• Short-term or long-term traffic management schemes,
• High-risk merging zones or accident-prone pinch points,
• ✅ Official UK road sign for left-side narrowing,
• ✅ Fully compliant with TSRGD Diagram 517A and UK safety standards,
• ✅ High visibility and weather-resistant design,
• ✅ Six standard UK sizes available,
• ✅ Fast, free UK-wide delivery direct from manufacturer
| Feature | Details |
|---|---|
| Product Name | Road Narrows on Left Ahead Sign |
| Diagram Number | 517A |
| 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 517A, 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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