Paschal Donohoe (Dublin Central, Fine Gael) | Oireachtas source

That will be the subject of engagement we have with the European Commission. If a withdrawal treaty is implemented and has a backstop contained in it, we know that if the future trading relationship between the UK and the EU does not allow the movement of goods between Northern Ireland into Ireland, it is very likely that the backstop will be operational. In that case, there will be regulatory alignment between the North and the South, which will entail the free movement of goods. If we do not have an agreement and a disorderly environment prevails, the movement of that truck will have to be determined by processes agreed between the European Commission, the UK and Ireland.