Yet....!!

Gerry, if you drive at 50km on the freeway you can be fined for obstructing traffic. You are required by law to do at least 20km below the limit, if you're car can't do that, or you choose not to, you can be fined, or asked to exit the freeway (the second one has happened to me in my step sisters 1964 ford anglia)

cops pressence on the road isn't that high in Perth, altho, when they are behind you in traffic, you watch how perfectly everyone drives!! merging and all!!