United States → Ireland
Driving in Ireland when you know the US
Differences first, worst-to-get-wrong first. Rules that match are folded away at the bottom.
What to check before you drive in Ireland
These are the key destination rules to check first. The comparison below shows every verified difference. Follow local signs and instructions on the road.
- Which side of the road do you drive on in Ireland?
- In Ireland you drive on the left.
- What is the speed limit in Ireland?
- 120 km/h on motorways, 100 km/h on dual carriageways, 80 km/h on country roads and 50 km/h in towns and cities. Those are the national default limits, which apply where no sign says otherwise.
- What is the drink driving limit in Ireland?
- The legal limit in Ireland is 50 mg/100ml. Much stricter than Great Britain's 80 — a pint can put you over here. Drivers who passed their test recently are held to 20 mg/100ml.
- What do you have to carry in your car in Ireland?
- Nothing. Ireland requires no equipment by law.
Read the full driving rules in Ireland and the required car equipment in Ireland .
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Rental agencies often have their own rules on driving ages and equipment, make
sure you check with them before you travel.
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What's different (2)
Which side of the road you drive on
CriticalUS · homeRightThe same in every state. Road traffic law is state law, so the citation is Californian: the Vehicle Code requires a vehicle to be driven on the right half of the roadway. No state differs.Checked 9 Aug 2026
Whether you need an International Driving Permit
CriticalUS · homeDepends on where your licence is fromDepends on your licence country and on the state. Not every state requires an International Driving Permit, and the US does not issue them to visitors — get one at home before travelling. Check the destination state's motor vehicle department.Checked 3 Aug 2026
Ireland · destinationNot requiredA valid licence in English or Latin script is enough for visits. Licences in other scripts should be carried with an International Driving Permit.Checked 6 Aug 2026 · official source
Known on one side only (27)
Speed limit on the motorway
Varies by regionUS · homeNo single national answer:
Texas75 mph — about 121 km/hThe commission may set 80 or 85 where the road is designed for it — the highest signed limits in the country.Checked 3 Aug 2026
California65 mph — about 105 km/hThe general maximum unless 70 is posted.Checked 3 Aug 2026
Speed limit on country roads
Varies by regionUS · homeNo single national answer:
Texas70 mph — about 113 km/hThe statutory maximum unless the commission raises it for a numbered highway.Checked 3 Aug 2026
California55 mph — about 89 km/hOn a two-lane undivided highway, and for anything towing a trailer.Checked 3 Aug 2026
Ireland · destination80 km/hRegional (R-numbered) roads. Small local (L-numbered) roads are 60, not 80, and have been since February 2025. Look for the white circle with five diagonal black lines and a "Go Mall / Slow" plate — that sign means 60.Checked 16 Aug 2026 · official source
Speed limit in towns and cities
Varies by regionUS · homeNo single national answer:
Texas30 mph — about 48 km/hThe default through an urban district unless zoned otherwise.Checked 3 Aug 2026
Ireland · destination50 km/hCouncils are cutting town centres and housing estates to 30, one area at a time, with a target of March 2027. Read the signs rather than assuming 50.Checked 16 Aug 2026 · official source
How much alcohol you may have in your blood
Varies by regionUS · homeNo single national answer:
California0.08 % BAC — about 80 mg/100mlChecked 3 Aug 2026
Ireland · destination50 mg/100mlMuch stricter than Great Britain's 80 — a pint can put you over here.Checked 6 Aug 2026 · official source
What you must carry in the car
US · homeNot yet verified
Ireland · destinationNothing — no equipment is legally requiredNothing is legally required. Asked directly whether anything must be carried, the Road Safety Authority answers no, then lists what it advises instead.Checked 20 Aug 2026 · official source
Speed limit on a dual carriageway
US · homeNot yet verified
Ireland · destination100 km/hThis is Ireland's national road limit — the green-signed N roads, dual carriageway or not. A cut to 80 on national secondary roads is in the Road Traffic Act 2024 but has not started, so 100 still applies.Checked 16 Aug 2026 · official source
Speed limit when towing a trailer or caravan
US · homeNot yet verified
Ireland · destination
- Motorway — 80 km/h
- Dual carriageway — 80 km/h
- Country roads — 80 km/h
Alcohol limit for drivers who passed their test recently
US · homeNot yet verified
Ireland · destination20 mg/100mlLearners and drivers in their first two years — effectively zero.Checked 6 Aug 2026 · official source
Youngest age you may drive
US · homeNot yet verified
Ireland · destination17 yearsCategory B. A learner permit still requires a fully licensed driver of at least two years' standing in the car with you.Checked 16 Aug 2026 · official source
Holding a phone while driving
Varies by regionUS · homeNo single national answer:
CaliforniaNot allowedChecked 3 Aug 2026
Ireland · destinationNot allowedCourt fines can reach 2,000 euros.Checked 6 Aug 2026 · official source
Turning at a red light
Varies by regionUS · homeNo single national answer:
CaliforniaAllowedAfter a complete stop at the limit line, yielding to pedestrians, unless a NO TURN ON RED sign is posted.Checked 3 Aug 2026
Ireland · destinationNot yet verified
Who must wear a seatbelt
US · homeNot yet verified
Height below which a child needs a child seat
US · homeNot yet verified
Ireland · destination150 cmOr under 36 kg. Licensed taxis are exempt.Checked 6 Aug 2026 · official source
Helmets on a motorbike or scooter
Varies by regionUS · homeNo single national answer:
TexasRequired for rider and passengerRider and passenger. A person aged 21 or over may ride without a helmet only if they have completed an approved motorcycle safety course or hold health insurance that covers motorcycle injuries. Police may not stop a rider just to check this.Checked 2 Sep 2026
CaliforniaRequired for rider and passengerDriver and any passenger, on a motorcycle, motor-driven cycle or moped.Checked 2 Sep 2026
Ireland · destinationRequired for rider and passengerThe regulation says the driver and the passenger of a motorcycle shall each wear a crash helmet in a public place. Riding without one, or carrying a passenger without one, is an 80 euro fixed charge.Checked 2 Sep 2026 · official source
Largest motorbike or scooter you may ride on a car licence
Varies by regionUS · homeNo single national answer:
Texas
- Engine up to 50 cc
- Power up to 5 hp
- Top speed up to 30 mph
CaliforniaNone — you need a motorcycle licenceA car licence (Class C) covers no moped or motorcycle. A moped (top speed 30 mph, under 4 brake horsepower) needs a Class M2 licence or endorsement; anything larger needs Class M1. One exception: the holder of a California licence of any class may ride a rented moped for up to 48 hours without the M2 endorsement.Checked 2 Sep 2026
Ireland · destinationNone — you need a motorcycle licenceA car (category B) licence covers no moped or motorcycle. The RSA says a learner permit is required for category AM even if you hold a full licence in another category such as car, van or truck. One exception, stated on the RSA's licence categories page: an Irish B licence issued before 21 October 2006 carries AM, as long as it has not been expired for more than 10 years. The RSA does not say whether foreign B licences get any moped allowance.Checked 2 Sep 2026 · official source
What a rider must wear or carry
Varies by regionUS · homeNo single national answer:
CaliforniaNothing beyond a helmetThe DMV Motorcycle Handbook says the only item required by law is a DOT-compliant helmet. Eye protection, jacket, gloves and boots are recommended, not required.Checked 2 Sep 2026
Ireland · destinationNothing beyond a helmetOnly the helmet is law. The RSA says it recommends that a pillion passenger wears a motorcycle jacket, trousers, gloves and boots, and the Rules of the Road use "should" for all rider clothing and reflective jackets.Checked 2 Sep 2026 · official source
How you pay for motorways
US · homeNot yet verified
Ireland · destination
- Toll booths
- Electronic tolls with no barriers
Alcohol limit for professional drivers
Varies by regionUS · homeNo single national answer:
California0.04 % BACCommercial vehicles, and passenger-for-hire driving.Checked 3 Aug 2026
Ireland · destinationNot yet verified
How long you may drive on your own licence
US · homeNot yet verified
Ireland · destination12 monthsAs a visitor, on your own country's licence.Checked 6 Aug 2026 · official source
Hands-free phone calls
Varies by regionUS · homeNo single national answer:
CaliforniaAllowed, with restrictionsAdults may use hands-free mode. Drivers under 18 may not use a phone at all.Checked 3 Aug 2026
Youngest age you may ride the smallest class of scooter
Varies by regionUS · homeNo single national answer:
Texas15 yearsFrom 15 a person may hold a restricted Class M licence for motorcycles of 250 cc or less, which also covers a moped. The restriction lifts at 16. An ordinary car licence, which covers mopeds too, is issued from 16.Checked 2 Sep 2026
California16 yearsRiders under 21 must first complete a training course and hold an instruction permit for six months.Checked 2 Sep 2026
Ireland · destination16 yearsCategory AM: mopeds and light quadricycles. A1 (up to 125 cc) is also 16.Checked 2 Sep 2026 · official source
Riding between lanes of slow traffic
Varies by regionUS · homeNo single national answer:
TexasNot allowedSince 1 September 2023 a motorcycle may not be ridden between lanes of traffic moving in the same direction, or pass a vehicle inside the same lane. Two motorcycles may ride side by side in one lane.Checked 2 Sep 2026
CaliforniaAllowedLane splitting, riding a two-wheeled motorcycle between rows of stopped or moving vehicles, is legal. The Highway Patrol publishes safety guidelines, which are advice rather than law.Checked 2 Sep 2026
Ireland · destinationNot yet verified
Smallest motorbike allowed on the motorway
US · homeNot yet verified
Ireland · destination
- Engine at least 50 cc
- Top speed at least 50 km/h
Headlights on a motorbike in daytime
Varies by regionUS · homeNo single national answer:
TexasRequired at all timesAt least one headlamp must be lit whenever a motorcycle is ridden. Motorcycles made before model year 1975 are exempt.Checked 2 Sep 2026
CaliforniaRequired at all timesA motorcycle first registered from 1978 must have a headlamp that switches on with the engine and stays lit while the engine runs.Checked 2 Sep 2026
Ireland · destinationNot requiredNo law requires a headlight in daylight. The RSA says it is advisable to use dipped headlights at all times. Lights are needed at night and when visibility is seriously reduced.Checked 2 Sep 2026 · official source
Emergency number
US · home911Checked 3 Aug 2026
Ireland · destinationNot yet verified
What you should carry, but do not have to
US · homeNot yet verified
Ireland · destination
- Warning triangle
- First aid kit
- Fire extinguisher
- Spare bulbs
Typical fines
US · homeNot yet verified
Ireland · destination
- Minor speeding — fine from 160 EUR, 3 points (The fixed charge notice. It becomes 240 euro if unpaid after 28 days, and 320 euro plus a court date after 56 days.)