hey there folks I am from Northern Ireland, so feel free to ask me questions
just wanted to make anyone aware that if you hire a car in Ireland at dublin airport and drive it across the border into Northern Ireland it will incur a charge of some sort from the hire company as well as that Northern Ireland like the rest of the UK drives in miles per hour Ireland drives in kilometres please be aware road signage is DIFFERENT on both sides of the border below i have posted a link to the UK highway code (that is the road rules in the UK ) this version is the Northern Ireland version as the mainland version (the mainland being England Wales and Scotland) has things in it like advice on tram crossings etc and we do not have trams in NI but we do have trains!).
Northern Ireland highway code
https://www.nidirect.gov.uk/articles/highway-code