Mike Penning, the Road Safety Minister, will order police and local authorities to stop treating drivers like "cash cows" and open up a whole range of previously hidden statistics to the public, The Sunday Telegraph has learned.The evidence will give a broad picture - for the first time - of whether cameras have been effective in saving lives and preventing injury - or whether they are simply useful revenue raisers.Up until now authorities have been reluctant to publish admit which cameras were the biggest income generators, with details having...