A Welsh Government spokesperson said:
"We do not control the tolls - the UK Government do. That's why we have called on the UK Government to open discussions with us on the arrangements governing the Severn Crossings after 2018."
Plaid Cymru has accused the Welsh Government of failing to apply pressure to try to stop the Severn toll prices rising. The party has found, via a Freedom of Information request, that there has been no correspondence on the subject between Cardiff Bay and Westminster since May 2011.
Plaid leader Leanne Wood says the toll rises are 'hurting Welsh businesses'. She has also called for 'evidence of discussions taking place' over who will take control of the bridges once they pass into public ownership around 2017.
Toll charges for the Severn Bridges rise tomorrow - by up to 3.3% - which is above inflation.
- Category I - cars and motor caravans - rises from £6.00 to £6.20 (3.3%)
- Category II - small goods vehicles and small buses - rises from £12.10 to 12.40 (2.5%)
- Category III - heavy goods vehicles and buses - rises from £18.10 to £18.60 (2.8%)
The organiser for the campaign group against Severn bridge tolls is warning that unless urgent action is taken to stop the UK government from increasing the toll charges every year, motorists could end up paying £10 to cross the bridges into Wales.
Councillor John Warman says road users face a "bleak year" and will now have to pay £6.20 as the rate of inflation rises to 3.3 per cent. The campaigner says the rise would have a "devastating effect on the economy in Wales and stunt growth".
Cllr Warman is calling on the Welsh Secretary David Jones to justify the hike in tolls to the people of Wales as he claims the cost of building the bridges has already been paid off.
Campaign Against Severn Bridge Tolls says it will be stepping up its campaign in the new year.