Slow Moving Vehicles Likely on Incline Ahead Warning Sign – Diagram 583 | Permanent UK Traffic Sign

Slow Moving Vehicles Likely on Incline Ahead Warning Sign – Diagram 583 | Permanent UK Traffic Sign

The Slow Moving Vehicles Likely on Incline Ahead Warning Sign – Diagram 583 is a key UK traffic sign used to alert drivers of a steep incline or descent where slow-moving heavy vehicles, such as lorries or HGVs, may be encountered. Commonly placed before long uphill climbs or steep downhill sections, this sign helps drivers prepare for reduced-speed traffic, overtaking restrictions, and potential hazards.

Fully compliant with TSRGD Diagram 583, BS EN 12899-1, and Chapter 4 of the Traffic Signs Manual, this permanent warning sign is available in RA2 or R3B reflective classes and manufactured from durable aluminium, composite, or self-adhesive sticker substrates for maximum durability and visibility in all weather conditions.

Available in all UK-standard triangle sizes — 450mm, 600mm, 750mm, 900mm, 1200mm, and 1500mm — and compatible with channel fixing rails, plate-only fittings, or adhesive backing to meet every installation need.

Technical Review

Diagram 583 features a red-bordered triangle containing a black silhouette of a heavy goods vehicle descending or ascending a steep slope. The design immediately communicates the potential presence of slow-moving or struggling vehicles on inclines, providing crucial information for following drivers to adjust speed and remain alert.

Why Choose Morelock for Your Diagram 583 Sign?

Manufactured to TSRGD Diagram 583 and Chapter 8 specifications
RA2 or R3B reflective options for visibility day and night
Constructed from premium-grade aluminium, composite, or sticker material
Available in six UK-standard triangle sizes
Multiple mounting formats: channel rail, plate-only, or adhesive
Made in the UK and shipped with fast delivery options

Ideal For:

• Steep hills and gradient zones
• Roads with frequent HGV or haulage traffic
• Motorway slip roads and climbing lanes
• Rural and mountainous roadways
• Quarry or logging routes with heavy slow vehicles

Summary (Why You Should Buy This Product)

• Official UK sign for slow vehicles on inclines
• Fully compliant with TSRGD Diagram 583
• Built to last with reflective and durable materials
• Supplied in all UK triangle sign sizes
• Manufactured and shipped from the UK

Product Specifications Table

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