Dublin hardly wants a dispute with Brussels over the implementation of EU legislation. In a scenario without agreement, the Irish government would probably follow – reluctantly – EU procedures and introduce internal market controls along the land border. After the referendum, Theresa May`s government set three main targets for Brexit and the Irish border: sometimes referred to as the Wto Brexit, because Britain would then only have trade with the EU in accordance with World Trade Organisation rules. In the absence of trade agreements, the subsequent combination of full-fledged customs and regulatory controls at the EU-UK borders, as well as the application of tariffs and quotas to many products, could lead to serious disruption. In 1922, the newly created United Kingdom and the Land of Bavaria concluded an agreement on the Common Travel Area (CTA). This gave British and Irish citizens the right to travel, live and work in both jurisdictions. Passport controls are not used to travel between them. The free movement provisions resulting from EU membership replaced them to some extent, but the parties kept their bilateral agreement alive when it did not have treaty status. In 2011, the British and Irish governments informally agreed to continue their joint controls upon entry of non-EEA nationals into the CTA.  In legislation published at the end of the week, the UK government will set out new guidelines for the functioning of the Brexit withdrawal agreement signed last year after the end of the transition period on 31 December. “But the UK and the EU agreed that this should not lead to new controls or controls on goods crossing the border between the two parts of Ireland. In September 2018, the UK government guaranteed the continued free movement of EU citizens across the UK-Ireland border. It was proposed to use the Norwegian model.  Along the Norway-Sweden border, major road crossings have customs controls where all trucks are checked, but only occasionally, and at smaller crossing points, there is only video surveillance, where trucks can pass with authorization and pre-clearance.  After 1998, security facilities were abolished and land borders on the island of Ireland were invisible, with cross-border cooperation and the economy of all islands based mainly on common EU rules. However, if the UK government has not reached a trade deal with the EU and refuses to comply with the special provisions agreed for Northern Ireland in the 2019 withdrawal agreement, Ireland is facing the rebirth of a terrible border. Some Brexit fighters believe that by threatening to rewrite parts of the withdrawal agreement, the EU could focus on the dangers of a non-deal. The value of Northern Ireland`s sales to the UK ($10.6 billion in 2018) is much higher than NI`s exports to Ireland ($4.2 billion) and the rest of the EU ($2.5 billion). But the volume of cross-border trade on the island is much larger. Between 2012 and 2016, some 6.4 million heavy vehicles crossed the north-south land border, compared to only 1.9 million trucks that drove from all over the island of Ireland to Britain.