A motorway speed camera which has increased the number of crashes and injuries at its site is revealed today as the most profitable in Britain.

It is estimated to catch up to 500 drivers a day, generating nearly £1million a year in fines.

Yet accidents have risen by a quarter and casualties have almost doubled since the Gatso camera was installed on the M11 at its junction with the North Circular A406 near Woodford, Essex.

Police said crashes happened because motorists slowed down ahead of the camera and then speeded up once they were clear of it.

Campaigners demanded the scrapping of the camera and accused the authorities of using the devices to raise cash rather than save lives.

The camera, jointly run by Essex Council, the police and the Highways Agency, is on the southbound M11 where the road narrows from three lanes to two and the speed limit drops from 70mph to 50mph.

Figures released under Freedom of Information laws show that in the five years before the camera was put up, there were 13 accidents and 14 casualties. In the following five years, the number of accidents rose to 16 and casualties to 24.

Motoring campaigner Paul Pearson said: 'The undisputed fact is that no lives have been saved by this camera.'

From a guy with a calculator on pistonheads :

The camera is estimated to catch 500 people a day and there were 16 accidents in the 5 year period after it was installed.

16 accidents from 912,500 people speeding at that site.

Therefore, on average you would have to speed past that camera over 57,000 times in a five year period before you're involved in an accident. That's 30 times a day for 5 years.

Statistics are wonderful, aren't they?