This survey has identified a total of 164 sites out of a total of around 3300 sites where some changes or augmentation of speed limit signage warrants action to ensure consistency with the relevant Australian Standard.
At a significant proportion of these sites (41%) the appropriate signage has been approved but the approved signage differs from the on site signage due to a range of circumstances including collision removal and vandalism.
This suggests that it would be useful to tighten reporting mechanisms to improve the likelihood of a speed limit sign removed in a motor vehicle collision being reported to the responsible authority to ensure a timely replacement.
At almost half of the total number of locations the inconsistency is that a speed limit sign has been collocated with other signage. Although undesirable based on best practice this deficiency is unlikely to cause confusion regarding the speed limit applying on a particular section of road.
Another category that represents 13% of locations is where repeater signs are desirable more frequently than currently provided.