On unkerbed roads, the guide posts shall be offset up to 200mm outside the edge of shoulders, within the batter slope, with the delineators facing the direction of oncoming traffic. The required offset shall be determined by the Regional Asset Manager.

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On unkerbed roads, a culvert post with a regular guide post, (refer to Figures 10 and 11) shall be used where culvert headwall is located more than 2m from the edge of shoulder.

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The spacing of guide posts shall be in accordance with AS 1742.2-2009 and Clause 5 of this guideline. The guide posts are placed on both sides of the road.

In addition to guide posts there should also be installed floodway depth indicators in accordance with AS 1742.2-2009, Section 4.10 Water Crossings and Main Roads Guideline Drawing 201331-0045.

For visual uniformity, on unkerbed roads, sections of road where guide posts are installed shall have a consistent offset from the edge of shoulder and shall be at least 2km long.

Main Roads practice is that guide posts shall be positioned along the outer edge of the constructed floodway, refer to Figures 12, 13 and 14.

The culvert post with delineators are intended to highlight the location of a culvert headwall and to mark edge of road formation. Either a culvert post with a regular post, (refer to Figures 10 and 11) or a culvert post with delineators, refer to Figure 11A, shall be used to highlight location of culvert headwall.

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On bridge barriers and road safety barriers, delineators shall be located and spaced as per AS1742.2-2009, Clause 4.2.5.4 (b).

The following recommendations are proposed to ensure consistency in the application of culvert posts in marking out of culvert headwalls.

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On crests, guide posts shall be arranged so that the delineators on at least two pairs of guide posts are visible at all times to a driver, excluding any posts that are less than 40m ahead of the driver. Refer to Figure 4.

For technical specifications on types and installation requirements of guide posts and delineators refer, to Main Roads'  Technical Specification 602 Guide Posts.

Additional guide posts and culvert posts shall then be placed at culvert locations as per Clause 5.5. If a culvert is located within 15m of a normal guide post location, the guide post spacing should be adjusted to match with the culvert site.

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Guide posts are to be placed along the length of the merge taper at a spacing of 24m (Refer to Main Roads WA Standard drawings 200631-0039 and 201431-0021).

Below is an outline for determining the location of guide posts and culvert posts. For a diagrammatic description refer to Figure 11.

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To maintain visual uniformity there shall be consistency of guide posts types and delineators, longitudinally and laterally within sections of road. It is Main Roads practice that:

1906.2-2007 Reflective Materials and Devices for Road Traffic Control Purposes - Reflective Devices (non pavement application)

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A pair of guide posts shall be provided approximately every 25m (maximum) over the length of the floodway (L) to delineate the edge of the road pavement.

The Government of Western Australia acknowledges the traditional custodians throughout Western Australia and their continuing connection to the land, waters and community. We pay our respects to all members of the Aboriginal communities and their cultures; and to Elders both past and present.

For dual carriageways separated by a median, guide posts shall be located on both sides of each carriageway, with delineators facing the direction of oncoming traffic.

Application: Construction, light manufacturing, areas where nuisance noise is present, manufacturing plants with medium level noise area and long-term exposure

Guide posts and delineators shall be placed in accordance with Australian Standard AS 1742.2-2009 "Manual of Uniform Traffic Control Devices, Part 2: Traffic Control Devices for General Use".

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Regular guide posts (black dots) are positioned at key points i.e. end of curves. Spacing between these points is divided to provide a uniform spacing of guide posts as specified in Clause 5.2 Table 1 of this guideline.

Where "all night" street lighting is provided, guide posts are not required.  Where street lighting is routinely turned off during the night, guide posts shall be provided.

Main Roads requirements are that guide posts shall be placed at culverts where the headwalls are located less than 3 m from the outside edge of the shoulder. This may be the sealed edge of shoulder only where no unsealed shoulder exists.