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Road Narrows on Both Sides Ahead Warning Sign – Diagram 516. Warns drivers of narrowing carriageway on both sides. 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 Both Sides Ahead Warning Sign – Diagram 516 is an official UK traffic warning sign used to alert drivers that the carriageway ahead becomes narrower on both sides. Commonly installed on rural roads, country lanes, and roadworks, this sign improves safety by warning motorists to reduce speed, remain alert, and prepare for potential traffic bottlenecks.
Compliant with TSRGD Diagram 516, BS EN 12899-1, and Chapter 4 of the Traffic Signs Manual, this warning sign is manufactured from highly durable aluminium or composite substrates and is finished with RA2 or R3B reflective sheeting for optimal visibility during both daytime and night-time driving.
It is available in standard UK triangular sizes: 450mm, 600mm, 750mm, 900mm, 1200mm, and 1500mm, and can be installed using channel fixings, plate-only, or self-adhesive mounting for both temporary and permanent applications.
The sign features a red-bordered triangle containing two black vertical lines that bend inward, visually indicating a road narrowing from both sides. Its intuitive graphic provides a fast and clear warning for approaching drivers, helping them react accordingly.
✔️ Fully compliant with TSRGD, BS EN 12899-1, and Chapter 4
✔️ Reflective finish: RA2 or R3B for high visibility
✔️ Aluminium or composite material options
✔️ Sizes: 450mm, 600mm, 750mm, 900mm, 1200mm, 1500mm
✔️ Channel, plate-only, and self-adhesive mounting systems
✔️ Free UK-wide delivery with fast dispatch from Morelock
• Roads narrowing due to design or obstacles
• Roadwork zones and temporary lane changes
• High-risk, tight-road areas in rural or urban zones
• Local authority and contractor traffic signage
• Both permanent installations and short-term control
• ✅ Official UK warning sign for road narrowing on both sides
• ✅ Compliant with Diagram 516 and BS EN 12899-1
• ✅ Available in 6 standard sizes (450mm to 1500mm)
• ✅ Highly visible, reflective, and weather-resistant
• ✅ Fast delivery direct from the UK manufacturer
| Feature | Details |
|---|---|
| Product Name | Road Narrows on Both Sides Ahead Warning Sign |
| Diagram Number | 516 |
| 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 516, BS EN 12899-1, Chapter 8 |
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| 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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