The Irish government is now prioritising planning for a no-deal Brexit, according to its published contingency plan.
The document, which runs to more than 130 pages, outlines plans for 19 sectors should the UK leave the EU without a withdrawal deal.
It includes a move to purchase land at Dublin and Rosslare ports to deal with congestion caused by new custom checks.
Ireland's foreign minister said the plan was "stark" but "comprehensive".
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The UK leaving the EU without a deal will cause significant stress to the Irish economy, Simon Coveney said.
His comments come as it emerged Theresa May's cabinet has decided to "ramp up" preparations for a no-deal amid uncertainty over the fate of the prime minister's proposed EU exit plan.
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