Slow Moving Vehicles on Incline Ahead Permanent UK Road Sign 

- Post Mountable with 2 fixing rails

- Class 2 R2/RA2 Reflective

- Available in 450mm, 600mm, 750mm, 900mm Tri

Diagram 583 is a common sign used before the start of a steep incline where larger vehicles or lorries have to use a low / slow gear choice to reach the top of the incline. 

Material: R2/RA2 reflective overlay on aluminium composite backing

Fixing Method: 2 fixing rails for post mounting

Reflectivity: Class 2 R2/RA2

As per the UK Highways Traffic Sign Manual Chapter 4 - Warning Signs page: 75 The following advice is given:

19.2.1.  The slow‑moving vehicles signs, diagram 583 (S2‑2‑49, see Figure 19-2) and the associated plate “Slow lorries for” a distance (S2‑2‑49, see Figure 19-3), are intended for use on roads where the gradient is such as to have an adverse effect on the speed of heavy commercial vehicles, thereby causing a potential hazard to other vehicles in the same lane. This is not simply a question of congestion. The problem can occur even when there is more than one lane. At times of light traffic flow, a vehicle being driven in the left hand lane at 70 mph might close unexpectedly rapidly on a slow‑moving lorry, or on a queue of vehicles waiting to pass it.