Photo: Irek Marcinkowski / Pexels. Illustrative photograph.
Driving from Northern Ireland into the Republic of Ireland is straightforward, but the rules change the moment you cross. Speed limits switch from mph to km/h, the drink drive limits are lower, motorways have tolls and Irish law applies to you. This guide is for new and learner drivers in Northern Ireland: what changes, what your insurance covers and what to check before you go.
Key differences at a glance
| Northern Ireland | Republic of Ireland | |
|---|---|---|
| Side of the road | Left | Left |
| Speed units | mph | km/h |
| Motorway limit (car) | 70 mph (112 km/h) | 120 km/h (about 75 mph) |
| Drink drive limit, most drivers | 80 mg alcohol per 100 ml blood | 50 mg per 100 ml blood |
| Drink drive limit, learners and novices | 80 mg (same as other drivers) | 20 mg per 100 ml blood |
| Motorway tolls | None | Toll booths on major motorways |
| Cycle lane colour | Green | Red |
| New driver plates | R plates under GDL | N plates for Irish novice drivers |
Speed limits in the Republic: km/h to mph
Signs in the Republic are in km/h, and your speedometer’s main scale may be in mph. Learn these before you cross:
| Road type in the Republic | Default limit | Roughly in mph |
|---|---|---|
| Motorway (blue signs, M numbers) | 120 km/h | 75 mph |
| National road (green signs, N numbers) | 100 km/h | 62 mph |
| Regional road (R numbers) | 80 km/h | 50 mph |
| Rural local road (L numbers or none) | 60 km/h since 7 February 2025 | 37 mph |
| Built-up area | 50 km/h, or 30 km/h where signed | 31 mph / 19 mph |
Signs always override the default. Full detail: speed limits in Ireland 2026.
Worked example
You leave an NI motorway at 70 mph and join a motorway in the Republic. The limit there is 120 km/h, about 75 mph. A sign showing 100 means 100 km/h (about 62 mph), not 100 mph. A common mistake the other way: seeing “80” on a regional road and driving at 80 mph, when the limit is about 50 mph.
Drink driving across the border
The Republic’s limits are much lower than Northern Ireland’s. Irish law sets 20 mg per 100 ml of blood for learner, novice and professional drivers and 50 mg for everyone else. In Northern Ireland the limit is 80 mg for all drivers. If you are a new driver, check with the Road Safety Authority how the lower Irish limit applies to you. The simplest rule is not to drink at all if you are driving. See drink driving limits in Ireland and UK drink drive limits.
Is my car insurance valid in the Republic of Ireland?
- All UK vehicle insurance gives at least the minimum third party cover needed to drive in the EU, including Ireland.
- You do not need to carry a green card in Ireland, but you must have valid insurance.
- Minimum third party cover may be less than your policy gives at home. Check with your insurer whether your full cover applies abroad and for how long.
- Hiring a car? nidirect advises checking the insurance covers both Northern Ireland and the Republic if you will drive in both.
Licences, learners and R plates
Full licence holders
GOV.UK says to take your Northern Ireland driving licence with you to drive abroad.
Learner drivers
No. A Northern Ireland provisional licence does not let you drive in the Republic. The National Driver Licence Service says learner permits are only valid for driving in the country that issued them, and they cannot be exchanged for an Irish one. Insurance cover or an instructor in the car does not change this. The recognition of full UK licences for visitors is a separate rule and does not apply to provisional licences. NI rules, such as motorways only with an ADI, are NI law and do not carry across either.
R plates
Your R plate restrictions come from NI law. The Republic has its own N plate system for its novice drivers. If you are an R driver, check with the RSA or DVA whether you need to display plates in the Republic before you travel. See NI R plates and N plates in Ireland.
Penalty points and fines in the Republic
Offences you commit in the Republic are dealt with under Irish law, with Irish fixed charges and penalty points (a speeding offence there is 3 points). Bans and penalty points are treated differently. nidirect states that there is mutual recognition of driving disqualifications between the United Kingdom and Ireland, so a ban imposed on one side of the border can also apply on the other. Do not assume that crossing the border gets round a ban; if you have been disqualified, check your position with DVA before you drive. Ordinary penalty points are a separate question: recognition of bans does not mean every Irish point moves onto a Northern Ireland licence, so ask DVA how an Irish offence affects your record. Irish offences and charges: penalty points in Ireland. NI and GB points: driving penalties and endorsement codes.
Before you cross: checklist
- Licence with you.
- Insurance confirmed for driving in the Republic.
- Know the km/h limits, or switch your speedometer display to km/h if it has that option.
- Payment ready for motorway tolls.
- No alcohol if you are driving.
- Learner on an NI provisional licence? Do not drive in the Republic; have a full licence holder drive that part of the trip.
Common questions
Do I need anything extra to drive from Northern Ireland to the Republic?
No green card. Take your licence and make sure your insurance covers the Republic.
Is the speed limit in Ireland in km/h?
Yes. All limits in the Republic are in km/h. In Northern Ireland they are in mph.
Can I drive in the Republic on R plates?
A full licence lets you drive there, but NI R plate rules are set by NI law. Check with the RSA whether you need to show plates in the Republic.
Can a learner from Northern Ireland drive in the Republic?
No. NDLS says learner permits are only valid in the country that issued them, so an NI provisional licence does not cover driving in the Republic. Travel as a passenger for that part of the journey.
Are there tolls in Northern Ireland?
No. You will meet toll booths on major motorways in the Republic.
Do I drive on the left in Ireland?
Yes, the same as Northern Ireland.
Related: NI vs GB Highway Code differences, motorways and tunnels in Ireland and learning to drive in Ireland. Back to the main guide: Learning to Drive in Northern Ireland.
Sources
- nidirect, “Driving in Northern Ireland” (nidirect.gov.uk)
- nidirect, “Driving disqualifications” (nidirect.gov.uk)
- nidirect, “Motorways (253 to 273)”, The Highway Code for Northern Ireland (nidirect.gov.uk)
- GOV.UK, “The drink drive limit” (gov.uk)
- GOV.UK, “Vehicle insurance: Driving abroad” (gov.uk)
- GOV.UK, “Driving abroad” (gov.uk)
- Department of Transport, “Speed limits on rural and local roads change from 80km/h to 60km/h” (gov.ie)
- Irish Statute Book, “Road Traffic Act 2024”, Part 3 Speed Limits (irishstatutebook.ie)
- Law Reform Commission, “Road Traffic Act 2010”, sections 3 and 4, revised (revisedacts.lawreform.ie)
- Road Safety Authority, “Rules of the Road”, Section 11 Motorways and tunnels (Revision 5, hosted on garda.ie)
- National Driver Licence Service, Frequently Asked Questions, “Can I exchange my non Irish learner permit for an Irish one?” (ndls.ie)