How Much Does Speeding in WA Cost?

So, did you look this up because you just got flashed? As we enter another long weekend tonight, here is your reminder that double demerit points will be enforced all the way through to Tuesday. Many people like myself wonder at times what the going rate is for speeding. Here's what we got from the WA Police website (remembering this is only current as at the time of this post).  Also another important reminder is that sometimes when you are not caught speeding, you could end up killing or severely injuring someone. It's never worth the one minute you save.

This information is a guide only and should not be relied on for legal purposes. Full details of traffic offences and penalties are contained in the Road Traffic Code 2000.
Speeding by light vehicles
(Cars, motorcycles and other vehicles less than 22.5 tonnes Gross Combination Mass)

km/h over the speed limit	Fine	Demerits*
Not more than 9 km/h	$100	0
More than 9 km/h but not more than 19 km/h	$200	2
More than 19 km/h but not more than 29 km/h	$400	3
More than 29 km/h but not more than 40 km/h	$800	6
More than 40 km/h	$1,000	7

Police can impound the vehicles of drivers who exceed the speed limit by more than 45 km/h.
Speeding by heavy vehicles
(Vehicles with a Gross Combination Mass of 22.5 tonnes or more)

km/h over the speed limit	Fine	Demerits*
Not more than 9 km/h	$200	0
More than 9 km/h but not more than 19 km/h	$300	2
More than 19 km/h but not more than 29 km/h	$500	3
More than 29 km/h but not more than 40 km/h	$850	6
More than 40 km/h	$1,000	7

Police can impound the vehicles of drivers who exceed the speed limit by more than 45 km/h.

* Demerit points are doubled on long weekends and other prescribed holiday periods.

UPDATED: 14th September 2015