I have used your comment on the node referred to change the speed limit tags at that point. It is now 110kph on Woodie Woodie Road north of that node until the road name changes to Ripon Hills Road at the junction with Telfer Road. South of the node it is now 80kph and I extended this limit until it changes name to Woodie Woodie Access Road where it meets Skull Springs Road near the runway.
Can you confirm if this seems correct.
The speed seems too high in the north at the Woodie Woodie Road, Ripon Hills Road and Telfer Road junction area.

On another note are you able to confirm the Woodie Woodie Airport icon should be relocated to where the runway is. The airport name and icon seems to be within the mine at the moment. 
https://www.openstreetmap.org/#map=15/-21.65329/121.20739