Maximum Headroom Available at Arch Bridge Ahead Warning Sign – Diagram 531.1A | Permanent UK Traffic Sign

Maximum Headroom Available at Arch Bridge Ahead Warning Sign – Diagram 531.1A | Permanent UK Traffic Sign

The Maximum Headroom Available at Arch Bridge Ahead Warning Sign – Diagram 531.1A is a critical UK traffic sign used to alert drivers—particularly those operating HGVs, buses, and large plant vehicles—of restricted clearance under arch bridges. Its distinctive shape and format help ensure that over-height vehicles are warned in advance, reducing the risk of bridge strikes and costly road disruptions.

This triangular warning sign conforms fully to TSRGD Diagram 531.1A, BS EN 12899-1, and Chapter 4 of the Traffic Signs Manual. It displays the maximum headroom available—usually in imperial format (feet and inches)—alongside a downward arrow and bridge arch graphic to visually reinforce the low clearance hazard.

Available in all UK-standard triangle sizes (450mm to 1500mm), the sign is constructed using durable aluminium, composite, or self-adhesive vinyl and finished in RA2 or R3B reflective sheeting for superior night and weather visibility. Mounting options include channel rail, plate-only, or adhesive backing, suiting both permanent and temporary installations.

🔧 Technical Review

Diagram 531.1A is easily identified by its curved arch bridge graphic and dual-format height display. The black arrow and the clear “feet and inches” measurement ensure clarity for tall vehicle operators. This sign is vital for pre-emptive warning at arch structures, which have variable height profiles and lower clearance on the sides than in the centre.

✅ Why Choose Morelock for Your Diagram 531.1A Sign?

✔️ Compliant with TSRGD Diagram 531.1A, BS EN 12899-1, and Chapter 8
✔️ Displays height restriction clearly in imperial format
✔️ Manufactured in RA2 or R3B reflective finish
✔️ Made from aluminium, composite substrate, or sticker backing
✔️ Offered in 450mm to 1500mm triangle sizes
✔️ Flexible mounting options with fast UK production and delivery

📌 Ideal For:

• Roads passing under historic or arch-shaped bridges
• Routes frequented by lorries, buses, or abnormal loads
• Rail bridge approaches and rural infrastructure
• Sites requiring advance low clearance notification
• Areas where arch bridges may have reduced side height

🌟 Summary (Why You Should Buy This Product)

• ✅ UK-compliant warning sign for arch bridge clearance hazards
• ✅ Clear height indication with imperial measurement
• ✅ Durable, reflective, and fully weather-resistant
• ✅ Available in all triangle sizes and mounting styles
• ✅ Supplied direct from UK manufacturer with quick turnaround

📊 Product Specifications Table

🔗 Useful Road Sign Resources