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Tunnel Ahead Warning Sign – Diagram 529.1. Alerts motorists to upcoming tunnels with reduced visibility or altered driving conditions. Multiple sizes and reflectivity levels available.
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The Tunnel Ahead Warning Sign – Diagram 529.1 is an official UK road sign used to alert drivers to the presence of a tunnel ahead. Tunnels can present unique driving conditions such as limited lighting, enclosed space, ventilation changes, and specific speed limits, making it vital for motorists to be warned in advance and adapt accordingly.
Fully compliant with TSRGD Diagram 529.1, BS EN 12899-1, and Chapter 4 of the Traffic Signs Manual, this permanent warning sign is available in RA2 or R3B reflective sheeting, ensuring high visibility day or night. Constructed from durable aluminium, composite, or sticker substrate, the sign meets UK highway standards for use in both rural and urban tunnel approaches.
Offered in the full standard range of triangle warning sign sizes — 450mm, 600mm, 750mm, 900mm, 1200mm, and 1500mm — it can be mounted using channel fixings, supplied as a plate-only option, or applied using self-adhesive backing, making it ideal for permanent and temporary traffic control near tunnel entrances.
Technical ReviewThis sign features a bold black tunnel opening surrounded by a detailed white archway, enclosed in the iconic red-bordered triangle. Its clear visual symbolism prepares drivers to reduce speed and be ready for the change in conditions.
Why Choose Morelock for Your Diagram 529.1 Sign?
Officially compliant with TSRGD and Chapter 8 requirements High-performance RA2 or R3B reflective face Supplied in all UK-standard triangle sizes Made from long-life aluminium or composite materials Mountable via channel, plate-only, or self-adhesive fixing Fast UK delivery — manufactured and shipped locally
Ideal For:• Roadways approaching tunnels, culverts, or underpasses
• Enclosed or underground vehicle access points
• Temporary routes through excavation or urban redevelopment zones
• Hazard awareness on historical or narrow tunnel routes
• Low-light or low-ventilation traffic conditions
Summary (Why You Should Buy This Product)• UK-compliant warning sign for tunnels and underground passages
• Meets Diagram 529.1 and Chapter 8 regulations
• High-visibility finishes suitable for all lighting conditions
• Full UK-standard size availability
• Direct from a UK-based road signage specialist
Product Specifications Table| Feature | Details |
|---|---|
| Product Name | Tunnel Ahead Warning Sign |
| Diagram Number | 529.1 |
| 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 529.1, 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 |
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