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Controversial 20mph speed limit zones reduce road injuries by more than 40 per cent, researchers claim. Figures for collisions, injuries and deaths on London streets between 1986 and 2006 were analysed. Roads where a 20mph limit was introduced suffered 41.9 per cent fewer casualties and collisions than faster roads equivalent to 203 fewer injuries a year. Deaths or serious injuries to children were cut by half. The study, by the London School of Hygiene and Tropical Medicine, suggested that if the zones were extended across the whole of the capital, a further 692 casualties could be prevented every year. More