The debate over how effective speed cameras are in reducing accidents is set to be rekindled by the publication of data for sites in Somerset.

In Midsomer Norton and Radstock, none of the areas where mobile camera vans operate has seen a significant fall in accidents since their introduction.

The break-up of the partnership which ran the area's safety camera partnership means that no fixed cameras are currently working.

But mobile speed enforcement is carried out on the A367 Wells Road in Radstock, the A362 Frome Road in Radstock and Silver Street in Midsomer Norton.

There are three further sites in Bath and another in Keynsham.

The Government is pushing local authorities and police forces to publish accident data for every camera site in the country, although many have been taken out of action because of funding cuts or doubts over their effectiveness, including those in Wiltshire.

The figures for Midsomer Norton and Radstock show that on Frome Road in Radstock, where monitoring began in 2009, the number of accidents has varied between none in 2000 and 2003 and four in 2006 and 2007. In 2009 there were three accidents.

Wells Road in Radstock, where monitoring began in 2003, has seen accident totals range from four in 2007 to nine in 2003. In 2009 – the last year for which data has been provided – there were eight accidents, including one described as "serious or fatal".

On Silver Street in Midsomer Norton, where monitoring began in 2006, the number of accidents has ranged from none during 2009 to five in 2007.

So far 75 highway authorities have published some or all of their information about specific sites as part of the Department for Transport drive to increase transparency. A further 72 have yet to provide details.

The department is keen to see the data published, which it says will enable residents to judge if speed cameras are helping to reduce accidents.

Road safety minister Mike Penning said speed camera information was an "important priority", and was needed to improve openness and accountability to the public.

Links to available camera data have been published on the Department for Transport's website.

The police are also being pressed to publish the total number of offences recorded by cameras, and the number of speeding drivers given a fixed penalty notice or taken to court.

Information about camera sites in Bath and North East Somerset can be found by visiting tinyurl.com/3hzvpmf.