The evidence is spectacularly clear:  Hugely increased numbers of speeding tickets and reduced average speeds have had only an adverse effect on deaths and injuries in traffic accidents.  Government policies have been a catastrophic failure and motorists are paying the price in every way for bureaucratic incompetence. 

Click for more: detailed charts .

Note on the logarithmic scales used in the above graphs: 

The normal exponential growth equation is  y = e ^ax where a is a constant, x is the time variable and y is the population measure.  (e is approx 2.718)  This equation applies in situations where the increase in population is proportional to the size of the population, for example where a population has a net increase of 2% per year.  (In that case a = 0.02 for x measured in years.)

The natural logarithm is defined to be:  ln(y) = ln(e ^ax ) = ax.   This means that if we plot ln(y) against x we get a straight line of slope = a.   This is the reason for using logarithmic scales in these charts.   On a normal flat scale we would be observing changes in curved lines - much harder to identify and measure.

We expect that the growth/decline of traffic casualties will be proportional to the total number of them - that indicates a steady trend and will be shown on a logarithmic plot as a straight line. 

This was in fact what we see 1994-2000 inclusive - a steady decline in all the death/injury statistics.  From 2000 onward that decline has reversed in three out of the four statistics as shown here numerically: 

Average Annual Changes
	1994 through 2000	2001 through 2003
Deaths in 50 km/h zones	-13.0%	13.0%
Injuries in 50 km/h zones	-7.0%	10.4%
Deaths in 100 km/h zones	-1.6%	-2.3%
Injuries in 100 km/h zones	-3.4%	7.8%

Breakdowns of speeding tickets issued  (Source - Parliamentary Questions by Tony Ryall)