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Steep Hill Downwards Ahead Warning Sign – Diagram 523.1. Warns drivers of a steep downhill gradient ahead. Available in multiple sizes and reflective options.
Professional design, supply, and installation of all types of traffic signs across the UK.
Learn More 🚀The Steep Hill Downwards Ahead Warning Sign – Diagram 523.1 is a UK-compliant road sign used to alert drivers of a significant downhill gradient ahead. This warning is critical on steep descents where additional braking may be required, particularly for heavy vehicles, cyclists, and in poor weather conditions. The sign displays the exact gradient percentage to give drivers clear, advanced warning.
Constructed in full compliance with TSRGD Diagram 523.1, BS EN 12899-1, and Chapter 4 of the Traffic Signs Manual, this permanent warning sign is manufactured from durable aluminium or composite and finished with RA2 or R3B reflective sheeting to ensure excellent visibility at all times.
It is available in the full range of standard triangular sizes used in the UK — 450mm, 600mm, 750mm, 900mm, 1200mm, and 1500mm. Installation options include channel fixings, plate-only, and self-adhesive variants, making it ideal for both permanent and temporary use.
The sign features a bold diagonal black slope pointing downward from left to right, overlaid with a gradient percentage figure (e.g. “10%”). Framed within a red-bordered triangle, this highly recognisable symbol warns drivers to reduce speed and prepare for descent.
✔️ Fully TSRGD, Chapter 8, and BS EN 12899-1 compliant
✔️ High-grade RA2 or R3B reflective sheeting
✔️ Available in six standard sizes
✔️ Choice of aluminium, composite, or sticker construction
✔️ Flexible mounting: channel, plate-only, or adhesive
✔️ Manufactured and shipped quickly across the UK
• Steep downhill road sections
• Rural lanes, hill passes, and mountain routes
• Routes used by HGVs and heavy traffic
• Areas with increased brake-wear risk
• Temporary or long-term installations on dangerous descents
• ✅ Official UK warning sign for steep downhill gradients
• ✅ Compliant with Diagram 523.1 and Chapter 8 requirements
• ✅ Highly reflective RA2 or R3B finish
• ✅ Available in all UK standard triangle sizes
• ✅ Durable and weatherproof construction with free UK delivery
| Feature | Details |
|---|---|
| Product Name | Steep Hill Downwards Ahead Warning Sign |
| Diagram Number | 523.1 |
| 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 523.1, 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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