Devon and Cornwall also recorded a 204 per cent increase in six years, going from just over 14,000 to almost 43,000 last year.The other areas with the highest number of speeders last year were West Yorkshire with 174,796; the Metropolitan Police with 139,318, Thames Valley with 131,401 and Greater Manchester with 101,421.Meanwhile the West Midlands area has recorded a 55 per cent drop in the number of speeders down from 78,087 in 2011-12 to 34,966 last year.Cleveland also recorded a 46 per cent drop while Dorset was down 31 per cent and Sussex 29 per cent.The figures were collated Dr Adam Snow, a lecturer in criminal law at Liverpool John Moores University following research commissioned by the RAC Foundation.RAC Foundation director Steve Gooding said the disparity between the figures in different force areas was often down to local policing priorities.He said: “It is the job of police and crime commissioners, and chief constables, to target resources appropriately, recognising the issues of greatest local concern.”Changes and variations in the numbers of offences detected will reflect not just driver behaviour but also the extent of enforcement activity in any one year.”The National Police Chiefs’ Council has defended the use of speed awareness courses insisting they are designed to reduce the number of road casualties.But the number of fatalities on the roads has remained relatively constant over the past six years going from 1,754 in 2012 to 1,793 last year.Motoring groups insist speed awareness courses are more about generating revenue for forces at a time when budgets are under pressure and there is no evidence that they make the roads any safer. The number of drivers being caught speeding has soared by more than half a million during the past six years as cash strapped police forces increasingly resort to roadside cameras to raise revenue.Last year 2,292,536 motorists – equating to four every minute – were detected breaking the speed limit on Britain’s roads.That figure is up a third on the same period six years ago when just over 1.7 million drivers were caught going too fast.The sharp rise has been put down to the continued roll out of speed cameras across the country’s road network.In some force areas the number of drivers flashed for speeding has soared by more than 400 per cent.Around half of those who are caught now pay to attend a speed awareness course rather than opting to accept points on their licence.It is estimated that around a quarter of all British drivers have now been on a speed awareness course, and the schemes are believed to generate around £50 million annually for police forces.While constabularies are not supposed to profit from the courses they are able to recoup a maximum of £45 per driver to cover administration costs.The chances of being caught speeding varies widely across the country, with some force areas massively clamping down in recent years. More than 2 million speeding drivers are caught each yearCredit:PA The Avon and Somerset force area recorded the most speeding motorists last year, successfully catching up with just under 200,000.That figure was up from 38,654 in 2011-12, a staggering rise of 416 per cent over a six year period.Bedfordshire recorded an even higher increase of 428 per cent, going from 14,060 in 2011-12 to 74,297 last year.In both force areas 100 per cent of the drivers were caught as a result of speed cameras.Essex Police was up 269 per cent over the same period going from 25,980 in 2011-12 to 95,967 last year. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.