Two-Way Traffic Warning Sign – Diagram 521 | Permanent UK Traffic Sign

£8.77 – £86.41
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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.

If the product offers variations, Choose an option from each row:

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Two-Way Traffic Warning Sign – Diagram 521 | Permanent UK Traffic Sign

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.

🔧 Technical Review

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.

✅ Why Choose Morelock for Your Diagram 521 Sign?

✔️ 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,

📌 Ideal For:

• 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,

🌟 Summary (Why You Should Buy This Product)

• ✅ 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

📊 Product Specifications Table

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

🔗 Useful Road Sign Resources

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

The reflective materials used are weather resistant and designed for outdoor application. The range consists of three classes including RA1, R2/RA2, and R3B/R3C. The outdoor service life for each class of material is as follows: