Star.pngStar.pngStar.pngStar grey.pngStar grey.png

Warning Sign/Edge of Carriageway Marker

From Roader's Digest: The SABRE Wiki
Jump to navigation Jump to search

Edge-of-carriageway marker
A87 Glen Varragill - edge of carriageway.jpg
Red nearside marker mounted on a plastic post
Cameraicon.png View gallery (22)
TSRGD ref  : 560, 561
From  : 1964
To  : present

Placement of sign requirements

Information correct as of Traffic Signs Regulations and General Directive 2016 and Traffic Signs Manual (2019)


  • Between 75 and 150 mm diameter (if round). Between 45 and 180 square cm is rectangular
  • Either Red, Amber or White

Safety posts and discs

Enfield reflectors.JPG

Roadside posts painted with broad horizontal black and white bands and bearing small circular reflectors set in a larger disc at the top – officially termed safety posts and discs – came into use to mark the edge of the carriageway in hazardous locations, or to warn of other obstructions near the edge of the road, in the early part of the 20th century. Red reflectors were used on the nearside of the road and white on the offside.

Hazard markers

A82 Lewiston - chevron and barrier.jpg

As modified since application of the recommendations contained in the Warboys Report (1964), similar warning devices – now called hazard markers in the regulations – are reflective discs (diagram 560) or rectangles (diagram 561), using the same colours of red on the lefthand edge of the carriageway and white on the righthand edge of a single-carriageway road, together with amber on the righthand edge of a road carrying traffic in one direction only or adjacent to the central reservation of a dual-carriageway road.

They may be fixed to barriers, walls, safety fence posts, or any other object or structure adjacent to the carriageway. Where they are mounted on posts, these are also reflective, with alternate black and white horizontal bands, each between 225 and 350 mm deep. Post-mounted markers are generally rectangular and may be curved to fit the circular or elliptical cross-section of the post.

On single-carriageway roads the markers are frequently dual sided so that they are red on one side (facing traffic whose nearside they are on) and white on the reverse (as seen by traffic coming in the opposite direction).

Junction marker posts

A830 Morar - Junction marker post.jpg

Some authorities mark selected road junctions with a modified form of edge-of-carriageway marker. These are usually white plastic posts, often of a slightly wider diameter than the normal black and white ones but using the same coloured reflective markers, often in a band around the circumference of the post. These posts are positioned either side of a junction or other road access point to highlight its position.

Junction definition posts (Ireland)

Junction definition post, County Kildare - Geograph - 1819467.jpg

In the Republic of Ireland "junction definition posts" (sign F 902 in the Department of Transport's Traffic Signs Manual 2010) may be used to indicate the location of side roads. Circular in cross-section and about one metre high, they are coloured dark green (non-reflective) at top and bottom with reflective white and light green intermediate bands.

Snow poles

A93 Devils Elbow - Snow poles.jpg

Snow poles – which are edge-of-carriageway markers of considerably greater height than normal – may be used in areas prone to heavy snowfall (or to drifting which could hide standard-height markers) to provide a permanent indication of the edge of the carriageway to the operators of winter road maintenance and clearing plant.


Warning Sign/Edge of Carriageway Marker
Related Pictures
View gallery (22)
Enfield reflectors.JPGTSRGD 560.jpgA87 Glen Varragill - edge of carriageway.jpgA82 Lewiston - chevron and barrier.jpgA9 Crubenbeg - Etteridge junction.jpg
Traffic Signs
TypesInformation (UK TSRGD) • (IRL TSM) • Regulatory (UK TSRGD) • (IRL TSM) • Warning (UK TSRGD) • (IRL TSM)
UKAnderson report • Worboys report • Traffic Sign Design • TSRGD and TSM (Motorway alphabet • Transport alphabet) • Guildford Rules
IrelandTraffic Signs Manual • Gaeltacht Signage
MiscellaneousBilingual signs • List of Street Furniture Manufacturers
Warning Signs
List of Warning Signs in TSRGDAdvance Warning of Wig Wag Signals • Agricultural Vehicles • Bend • Cattle Grid • Cattle / Sheep • Children • Cross Roads • Cycle Route • Double Bend • Dual Carriageway Ends • Edge of Carriageway Marker • Falling Rocks • Flood & Try Your Brakes • Ford • Gate • Horses • Hump Bridge • Ice & Snowdrifts • Level Crossing with Gates or Barriers • Loose Chippings • Low Flying Aircraft • Maximum Headroom • Maximum Speed • Military Vehicles • Opening Bridge • Open Level Crossing • Other Danger • Overhead Electric Cable • Pedestrians • Plates below Signs • Quayside • Queues Likely • Reduce Speed Now • Risk of Grounding • Road Humps • Road Narrows • Roadworks • Roundabout • Sharp  Deviation of Route • Side Road • Side Winds • Slippery Road • Soft Verges • Staggered Junction • Steep Hill • Stop or Give Way Ahead • T Junction • Traffic Merges • Traffic Signals • Trams Crossing • Tunnel Ahead • Two Way Traffic • Uneven Road • Wild Animals (various)
Other Warning SignsAccident Black Spot

SABRE - The Society for All British and Irish Road Enthusiasts
Discuss - Digest - Discover - Help