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Two-Way Traffic Warning Sign – Diagram 521. Warns drivers that two-way traffic is 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 Two-Way Traffic Warning Sign – Diagram 521 is an essential UK road sign used to alert drivers that they are approaching or entering a section of road where two-way traffic flows. This warning is especially important where roads transition from dual carriageways, one-way systems, or diversions into two-way configurations.
Fully compliant with TSRGD Diagram 521, BS EN 12899-1, and Chapter 4 of the Traffic Signs Manual, this triangular warning sign is available in RA2 or R3B reflective sheeting and constructed using aluminium or composite substrates for long-lasting, weather-resistant performance.
Available in all standard triangular UK sign sizes — 450mm, 600mm, 750mm, 900mm, 1200mm, and 1500mm — this sign is suitable for both temporary and permanent installations, with mounting options including channel fixings, plate-only, and self-adhesive systems.
This triangle warning sign features a bold upward-pointing black arrow next to a downward-pointing black arrow, both inside a red-bordered triangle. The design clearly communicates the shift to a two-way traffic environment, improving awareness and reducing the risk of head-on collisions.
✔️ Officially compliant with TSRGD and Chapter 8 standards,
✔️ Available in RA2 or R3B reflective grades for maximum visibility,
✔️ Built using robust aluminium or composite materials,
✔️ Offered in six standard triangular sizes,
✔️ Mounting systems: Channel, plate-only, or self-adhesive,
✔️ Free UK-wide delivery with fast manufacturing turnaround,
• Roads transitioning from one-way to two-way traffic,
• Temporary diversion routes and contraflows,
• Motorways and dual carriageway ends,
• Rural and urban highways,
• Construction zones and roadworks,
• ✅ Official UK sign for two-way traffic warning,
• ✅ Fully reflective and weather-resistant finish,
• ✅ Compliant with Diagram 521 and BS EN 12899-1,
• ✅ Available in 450mm–1500mm sizes,
• ✅ Manufactured in the UK with free delivery included
| Feature | Details |
|---|---|
| Product Name | Two-Way Traffic Warning Sign |
| Diagram Number | 521 |
| 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 521, 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 | N/A |
|---|---|
| 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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