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.

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.

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

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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.

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.