Many speed cameras across Wales will be switched off in a bid to investigate the effectiveness in reducing accidents.

Welsh road casualty reduction partnership GoSafe, which operates all the cameras in the country, will review fixed sites to determine the level of success of each device.

Nearly half of the 157 cameras operated by GoSafe are already under review in Swansea, Carmarthenshire and Neath Port Talbot.

Though the authorities are determined not to remove the devices, funding them is a matter of concern, according to

The investigation follows the reduction in speed camera budgets by some councils in England.

GoSafe received £6.7m ($10.6m) in 2010 from the government, which has refused further allocations beyond March 2011.