Jessica Morden wants clarity on future of Severn tolls
5 March 2014 Last updated at 15:17 GMT
The UK government is again facing calls to reduce the tolls on the Severn crossings.
Newport East Labour MP Jessica Morden led a debate in Westminster on Wednesday.
She is asking for clarification on what will happen to the privately-run bridges when they revert to public ownership.
BBC Wales' parliamentary correspondent David Cornock reports.