The Secretary of State for Wales Simon Hart has said that he is "not going to rest" until the M4 relief road has been constructed.
Speaking to the House of Commons Welsh Affairs Committee Hart said that the UK government was still committed to the plan— despite it having been rejected by the Welsh Government.
He said: "I don't regard any idea as dead... we have to keep chipping away at these things. It may take years to persuade our colleagues to revisit these things... I'm not going to rest until we get a yes on this one."
Mr Hart also defended 'Muscular Unionism', and said that the UK Government was intent on being more proactive and visible in Cymru.