According to research carried out by the Times, road casualties in areas where street lights have been turned off have risen by 20% in four years. It found that 324 more people were killed or seriously injured in crashes at night on roads where street lights were unlit in 2011-12 than in 2009-10. Deaths rose by 39% to 25 and serious injuries rose by 27% to 225, analysis of 800,000 pieces of data collected by police showed. The Local Government Association said: "If councils were presented with evidence it 'turning off street lights' was causing a public safety risk they would act. However, this data fails to provide that evidence and it is completely misleading to suggest it tells us anything about the cause of accidents."