The Transport Minister has vowed there will be no pulling back from an upgraded Derry to Dublin road link as a result of Brexit.
Shane Ross said whatever the outcome of the negotiations on the UK leaving the EU, the new A5/N2 route would go ahead.
"We are committed to that," he said. " I don't see any danger to that.
"I see absolutely no pulling back from that at all and I don't see why Brexit should hinder that."
Mr Ross was speaking before an Oireachtas transport committee in Dublin.
The government has already committed 200 million euro to the southern links to the project as well as 465 million euro for the A5 section in Northern Ireland.
Fine Gael TD Peter Fitzpatrick told the minister guarantees should be sought from Stormont that motorists will not be charged on the new route.
Mr Ross said he did not know of any planned tolls.