Page:UK Traffic Signs Manual - Chapter 4 - Warning Signs. 2013.pdf/64



Drivers should expect to meet queues on the approaches to roundabouts or traffic signals, where adequate advance warning can usually be given using signs to diagram 510 (see paras 2.13 to 2.18) or 543 (see section 8) as appropriate. The "Queues likely” signs, diagrams 584 and 584.1, are intended for use where drivers might unexpectedly come across a queue, e.g. around a bend or over the brow of a hill. These signs should be used only where there is a persistent problem, causing a significant hazard, despite the presence of the standard warning signs and are not appropriate as a general warning of congestion. They should be sited sufficiently far in advance of the obstruction to the sight line to enable drivers to stop in time. Distance plates must not be used.

Where the queue is likely to be in a road that leads from a junction ahead, the "Queues likely" plate may incorporate an arrow pointing to the left or to the right as appropriate. Details are shown on the working drawing (see para 1.8).

The sign may also be used on motorways or other high-speed dual carriageway roads with grade separated junctions where queues on an exit slip road regularly extend back onto the main carriageway. Where queues on the slip road effectively shorten the deceleration length available, but do not usually extend onto the main through carriageway, the variant "Queues likely on slip road" should be used. Care should be taken to ensure that the assembly does not obstruct the driver's view of existing signs.

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