What is the main Use of hazard markers

Hazard markers may be used to highlight the start of a channelising island, median or separator, and on the central island of a roundabout in order to direct traffic past or around such an obstruction.

Rectangular in shape, hazard markers generally consist of a series of black and white bands of either diagonal strips where only a target is required, or chevrons, where directional as well as target properties are required.

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Typically, there are 4 types of hazard marker:-

1. Uni-directional Hazard Marker
Used to guide approaching traffic to the direction indicated by the chevrons i.e. to the left of right as required.

2. Bi-directional Hazard Marker
Used to delineate the nose of an island or other obstruction where traffic may pass the obstruction on either side.

3. Width Marker
Normally erected in pairs, one on either side of a vertical obstruction facing in the direction of traffic flow.

4. Obstruction Markers Used to delineate obstructions such as road closures or obstructions above the road.

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This category contains signs that are currently in use and will only be supported in the future until such time as all existing signs have been removed or replaced under normal maintenance arrangements.

Installation of new Category 2 signs and replacement of existing Category 2 signs is not permitted. Details of signs that are to be used in lieu of these signs are given in the relevant section.

Visit our Technical Library to view the Category 1 Hazard Signs, which are signs that are currently in use and continue to be supported.

Sign	Name	Sign No.	Replace with
	LARGE ARROW	MR-HM-13 (L or R)	Use MR-HM-3.
	LARGE ARROW	MR-HM-14 (L or R)
	LARGE ARROW BIDIRECTIONAL	MR-HM-15	Use MR-HM-2.

Hazard signs are used to highlight to approaching traffic a marked change in the direction of travel and the presence and width of an obstruction.

Guide signs are generally rectangular. Hazard signs are rectangular and generally consist of a series of alternate black and white bands. The white portion is always reflectorized, but the reflective material may cover only the central portion of each white band to achieve a balance between the areas of black and white under headlight illumination. The bands may consist of either diagonal strips where only a target is required, or of chevrons where directional, as well as target, properties are desirable.

Typically, there are 4 types of hazard marker:

Uni-directional Hazard Marker – used to guide approaching traffic to the direction indicated by the chevrons i.e. to the left or right as required.
Bi-directional Hazard Marker – used to delineate the nose of an island or other obstruction where traffic may pass the obstruction on either side.
Width Marker – normally erected in pairs, one on either side of a vertical obstruction facing in the direction of traffic flow.
Obstruction Marker – used to delineate obstructions such as road closures or obstructions above the road.