They also ensure that punishments such as penalty points on one's license and the ensuing increase in insurance premiums follow the driver home.
The general principle of such interstate, interprovincial, and/or international compacts is to guarantee the rule "one license, one record."
There is mutual recognition of driving disqualifications with Northern Ireland and the Republic of Ireland.1 The driver registration system of Northern Ireland has mutual recognition of driving disqualifications with the system in Great Britain and the Republic of Ireland.2 The Republic of Ireland has mutual recognition of driving disqualifications with Great Britain and Northern Ireland.3 1.
"Driving disqualification: agreements between Great Britain and other countries," Directgov (http://www.direct.gov.uk/en/Motoring/DriverLicensing/DrivingInGbOnAForeignLicence/DG_185285).
"Disqualified drivers targeted in international agreement," Northern Ireland Executive (http://www.northernireland.gov.uk/index/media-centre/news-departments/news-doe/news-doe-june-2008/news-doe-260608-disqualified-drivers-targeted.htm).