BBC News
By John Campbell
Published
image captionTrucks passing through customs at Dublin Port
Dublin Port has emerged as a major bottleneck for NI businesses trying to operate under new Brexit rules.
Around 20% of NI's trade goes through Dublin and haulage firms are reporting delays getting customs clearance for loads arriving from GB.
Freight companies in the Republic of Ireland have also reported difficulties.
The Irish customs authorities said part of the problem is businesses being unprepared for the new processes.
In a statement, the Irish Revenue Commissioners said they were surprised by "the extent to which [some businesses] hadn't really addressed the work that needed to be completed in the months and years leading up to 1 January".