Whilst I agree with the concept that motorists are responsible for their own behaviour on the road and should not endanger other travellers, I believe that on a road where the speed limit is 55mph, or realistically any speed, that vehicles using that roadway should be able to maintain a safe and non-obstructive speed on said roadways. If your vehicle cannot maintain such a speed, it shouldnt be on a road with other vehicles.
Having said that, Cyclists in sydney are a menace, running red lights into traffic and pedestrians, crossing through pedestrian crossings and running into people, generally ignoring the rules of the road. If they want equal access, they need to conform to the same rules.