Plaid Cymru's Shadow Transport Spokesman, Rhun ap Iorwerth says he believes that todays decision is a costly mistake. He believes that there will be a 15 year wait for the project to be delivered when an alternative route could have been completed a decade sooner.
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The Welsh Government will later launch new plans to reduce the number of children living in poverty in Wales.
Plaid Cymru are to launch their campaign this morning ahead of May's general election.
A study by Swansea University has found a fifth of students in the UK have considered working in the sex industry to fund their studies.