Sir – My sister was killed in a traffic accident leaving four children motherless.

So road safety is not an academic issue for me. I know how much safer speed cameras have made our roads, and I was dumbfounded to discover that Oxfordshire is abandoning them.

Even in economic terms it is senseless, as the letter from Dani Rabinowitz (July 29) makes clear. The most plausible explanation I can find is that the influential in our society, under this system, are unable to use wealth or privilege to shield themselves from severe penalties for speeding, and so have put pressure on our Government and council to change it. I owe it to my sister's family to campaign against the change.

John Bond, Oxford