When I drove on it a couple of months ago they had only just reopened it due to the rain, slippery in some places but still sat on 100kph for most of it.
It is called Hyden Norseman Rd, cuts about 100ks of the mian road, hardly any traffic just watch for mine trucks on crests and bends.
When you get to Norseman just ask directions at any service station.