Racedo....you are simply WRONG. I live on this island.I travel on a regular basis to and from Dublin via rail and/or motorway. There is NO check. There used to be a check when the customs got on the train at Dundalk but that hasn't happened for years. The border is defined ONLY by the road signs changing to KILOMETRES and the petrol prices dropping/climbing.
http://www.timesonline.co.uk/tol/tra...cle4392963.ece
Getting in and visas for Ireland
Proposals for controls on UK and Ireland travel - The Irish Times - Fri, Jul 25, 2008
From Irish Times
"However, the British say that "mirroring activity in the Republic" they will consider increasing "ad hoc immigration checks on vehicles in order to target non-CTA nationals on the Northern Ireland side of the land border"."
UK Home secrestary is accepting checks are already taking place in ROI, which they are. Just because you haven't been subject to them doesn't mean they are not happening.