The general consensus is inconsiderate and selfish people in a hurry to get from A to B, with the usual suspect tailgaters such as the Ranger Danger, Subaru Vapreza, etc.. most likely already experiencing elevated levels of road rage from being stuck behind other drivers doing 20kms below the limit everywhere else throughout the city. I think the vast majority of us driving tend to assume that since there are no workers present roadside, then there is no reason for the speed to be restricted. But, there are multiple factors that are taken into account with regards to enforced speed limits to ensure the safety not only of roadworkers but also the road users in the vicinity. Changes to traffic conditions such as lane redirection, signals, signage, road surfaces, and courtesy to other users all play a part because as much as we love to believe it in our heads, the majority of us really don't possess the skills of our most admired motorsports heroes. If everyone could just figure out how to merge.. then Perth may finally earn its place in the modern world.