In the Law and Order section of the Christian Party manifesto  they pledge to:
"Raise the motorway speed limit to 90mph".
Putting aside the obvious environmental implications of the increase in CO2 emissions of such a policy, the Parliamentary Transport Committee estimates  that an increase in the speed limit from 70mph to just 80mph would result in a 10 per cent rise in casualties.
However they also point out that accident frequency rises disproportionately with increasing speed. It rises approximately with the square of the average traffic speed.
In 2008 there were 7,249 speeding-related motorway accidents in 2008 (latest figures).
2,946 people were fatally hurt in crashes on Britain's roads in 2008.