SIR - In 2001, motoring ‘expert’ Jeremy Clarkson wrote an article claiming that: "Speed is good. Speed is right. Speed works."

It concluded, "telling us not to speed is like telling us not to breathe".

Now, research has found that, breathing toxic air causes a huge reduction in intelligence and is equivalent to having lost a year of education.

How many years of education is lost when a child is injured/killed by a speeding driver?

Allan Ramsay, Radcliffe Moor Road, Radcliffe