Roadworks sign placement

[Truvelo]

Can anyone advise me if there are guidelines or regulations on the placement of signs leading up to temporary traffic lights? Today on a 40mph dual carriageway there were temporary lights just around a bend. The signs - roadworks and traffic light warning signs were placed on the bend literally in front of the traffic lights. Should the signs have been placed before the bend next to the kicker arrow in the first photo? There was absolutely no warning of stationary traffic until the last second due to the house blocking the view.

The second photo shows the signs heading the other way just how close they are to the lights. Is this laziness by the contractor who can't be bothered to walk a bit further to place the signs a bit further out

[Bfivethousand]

Traffic Signs Manual Chapter 8

Section D5 (Single Carriageway Works) P. 111 onwards gives advice on approach sign spacings. I know where those works are (hope you had a peg for your nose!) and know that you're in a 40 there, therefore the distance between the first approach TM sign and the work zone taper should be an absolute minimum of 45 metres (Table 5.3). In this case, substantially towards the higher end of the parameters would be advised given the poor visibility and dual carriageway approach.

In response to your question - generally part laziness, part ignorance of guidelines in equal measure.

[the cheesecake man]

In my humble experience, for temporary lights on higher speed roads there's usually advance signs a few hundred yards ahead.

[Conekicker]

This document applies to all highways and roads, except motorways and any dual carriageways with a speed limit of 50 mph or more and is mandatory:

https://assets.publishing.service.gov.u ... tworks.pdf

The table on pdf page 107 gives the distances. Unfortunately, many gangs only work on 30mph single carriageways and often forget to place the signs further out on higher speed roads. Note very carefully that the quoted distance D is a minimum, there's nothing to stop you placing the signs further out if appropriate. Not that many people do, they miss (or never read) that bit of text above the top of the table.

On other roads, it's Chapter 8 for guidance on distances. Note "guidance", there's little to nothing mandatory about Chapter 8 (apart from in Northern Ireland).

ETA - as for the practicalities of this subject if, for example, on a NSL single carriageway you put the first sign encountered (Diagram 7001) out at 400 yards and queueing is anticipated beyond that point, there's nothing to prevent the designer placing an extra 7001 at, say, 800 yards and a Diagram 584 (Traffic queues likely on road ahead) with or without a prescribed supplementary plate at 600 or 700 yards out. You design to the site and the expected conditions, whilst on the lower speed roads also complying with the SAS booklet.