Driving bans are now mutually recognised on both sides of the Irish border due to a change in the law.
From Tuesday, people banned on the other side of the border from where they live will have the prohibition extended to their home jurisdiction.
The law change gives effect to a road safety agreement signed between the UK and Irish governments in 2015.
It covers drivers banned for reckless or dangerous driving, hit-and-runs and driving while under the influence.
Northern Ireland’s chief inspector of criminal justice, Brendan McGuigan, welcomed the change.
“I am delighted that from now on, those motorists found guilty in court in either jurisdiction will find their motoring bans do not disappear when they travel north or south, or east or west across the border,” he said.
“Motorists who choose to drive recklessly, or in a manner which creates a danger and places other road users at risk, cannot be tolerated, and I fully support the introduction of this legislative change.”
Irish Transport Minister Shane Ross said it was an important road safety measure, targeting dangerous drivers.
“The new measures are underpinned by an international agreement between Ireland and the UK, which comes into effect today, and primary legislative provisions in Ireland and the UK, which have been commenced (on Tuesday),” he said.
“Under the Ireland-UK agreement, the driving disqualification is, in effect, transferred by the state which imposes it to the licence of the offender’s ‘home’ state.
“So, the legal consequence of the offence committed follows the offender home.”
The SDLP’s infrastructure spokesperson Daniel McCrossan said: “This legislation is a major step in tackling dangerous and careless drivers on this island. This is a practical, common-sense measure.”