The number of serious accidents on 20mph roads has risen by over a quarter over the past year, according to analysis of government data by the Institute of Advanced Motorists (IAM).
The number of slight accidents on 20mph roads also rose by 17 per cent, despite slight and serious accidents on 30mph roads falling by five per cent and nine per cent, respectively. 40mph roads also saw a drop in accident numbers, with slight and serious accidents dropping by three per cent and seven per cent, respectively.
The number of casualties on 20mph roads also rose, with serious casualties increasing by 29 per cent and slight casualties by 19 per cent.
IAM chief executive Simon Best said: "The government and councils need to take stock on the effectiveness of 20mph signs. Recent advice, guidance and relaxation of regulations has all been about making it easier for councils to put 20mph limits in place.
"More and more roads are being given a 20mph limit but they do not seem to be delivering fewer casualties. The IAM are concerned that this is because simply putting a sign on a road that still looks like a 30mph zone does not change driver behaviour. More evaluation and research is needed into the real world performance of 20mph limits to ensure limited funds are being well spent."
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