If speed cameras were effective the govt would budget for less and less money each year.

If speed cameras were effective the road toll would drecrease over time, so why then is the road toll graph for the last 10 years damn near horizontal?

The most effective speed camera/device, is the one often used at road works whereby it tells you your speed, but does not take your pic. Few don't react to these signs. If authorities where truly serious about road safety they would install similar signs in several areas. Of cause this will never happen as it will deplete revenues. However, if by some miracle we do manage to reduce road trauma all we would have to do then is find replacement jobs for the thousands out of work, or at least, underemployed because like it or not, road accidents employ thousands.