The information below is intended to reflect the preferred practice of Main Roads Western Australia ("Main Roads"). Main Roads reserves the right to update this information at any time without notice. If you have any questions or comments please contact Sabesh Sivapatham by e-mail or on (08) 9323 4678.
To the extent permitted by law, Main Roads, its employees, agents, authors and contributors are not liable for any loss resulting from any action taken or reliance made by you on the information herein displayed.
Guide posts are not usually provided at driveways.
Type A (Corner cubed delineator)
Class 1A Retroreflective Delineator
Class 1 retroreflective sheeting delineators are no longer used by Main Roads due to poor photometric performance.
As per AS 1742.2-2009, the following colours shall be used for the purpose described:
On the right side of two-way roadways i.e. single carriageway.
On the right side of one-way roadways i.e. dual carriageway (including divided roads).
On the left side of the roadway.
Refer to Figure 1, 2, 3 for an illustration of the above.
On unkerbed roads, the guide posts shall be positioned at the outside edge of shoulders, this may be the sealed edge of shoulder only where no unsealed shoulder exists, so that the delineators face the direction of oncoming traffic.
Spacing of Guide Posts on curves shall be in accordance with the following Table:
Guide posts on curve transitions shall be placed in accordance with Clause 18.104.22.168 (c) of AS 1742.2-2009.
5.4.1 The use of Culvert Posts to mark Culvert Headwalls (Optional)
Below is an outline followed by an illustration (Figure 11) of determining the location of culvert posts alongside guide posts.
Step 1 -
Regular guide posts are positioned at key points i.e. end of curves regardless of culvert locations. Spacing between these points is divided to provide a uniform spacing of guide posts as specified in AS 1742.2- 2009.
Step 2 -
Additional regular guide posts are added at culvert sites, as per current MRWA guideline.
Step 3 -
Culvert posts shall then be placed 1.0m outside the line of the guide posts.
Positioning of Culvert Posts
Red guide posts are to be placed along the length of the merge taper at a spacing of 24m.