Speed limits in Ireland: know the laws for your next road trip

Speed limits in Ireland: know the laws for your next road trip
If you’re planning a road trip on the Emerald Isle it’s important to familiarise yourself with the rules of the road before you set off. 

Here, we take you through speed limits on different roads, speed limits at different times of day and what to expect if you’re caught speeding.

Irish speed limits: the law


First things first: Irish speed limits are given in kilometres per hour (kph) so if you’re used to measuring your speed in miles per hour (mph), you’ll need to convert numbers on road signs into something more meaningful.Your speedometer should have both numbers marked, usually in another colour and on the inside of the semicircle.

Thankfully, there shouldn’t be any confusion about what a speed limit sign looks like, as most of them are almost identical to road signs in the UK. 

Another useful point to remember is that speed camera detectors are illegal. You should turn off any camera detection features on mobile apps and leave speed detection devices at home to avoid any punishments from the Garda (Irish police force).1

Irish speed limits for different roads

Type of roadSpeed limit
Motorway120 kph (74 mph)
National roads (primary and secondary)100 kph (62 mph)
Non-national roads (regional and local)80 kph (49 kph)
Roads in built-up areas (e.g. cities and towns)50kph (31 mph)
Special. speed limits for densely populated areas30 kph (18 mph)

There are also different speed limits for different types of vehicles. The 80 kph (49 mph) limit for any vehicle towing a trailer or caravan is probably the most relevant for drivers visiting from the UK.

If you’re towing a trailer or caravan through Ireland, you should never exceed the 80 kph (49 mph) limit even when travelling on motorways and national roads.

Special speed limits may also apply:

  • at different times of day
  • on different sides of a dual carriageway
  • on particular sections of road, for example, in a tunnel where a lane must be closed 
  • where there are a series of bends
  • at roadworks

European Breakdown Cover

Get covered when driving in Europe from just £7.*

Types of speed limits in Ireland

100kmph sign

Motorway speed limits in Ireland

You should never exceed 120 kph (74 mph) when travelling on Irish motorways and remember, if you’re towing a trailer or caravan this limit is reduced to 80 kph (49mph).

There may be times when you’re asked to drive at slower speeds, especially when approaching and driving through roadworks. Be careful and look out for roadside signs and information on gantries for any changes in speed limits that you’ll need to stick to.

The Road Safety Authority (RSA) recommend that you abide by the two-second rule to ensure you keep a safe stopping distance from vehicles in front of you.

This means keeping two seconds away from vehicles in front in good driving conditions and doubling the distance when the road surface is wet. You can even try saying ‘Only a fool breaks the two-second rule’ twice in your head as the car in front of you passes a fixed point, like a sign. If you pass the same fixed point before you’ve finished saying it, you’re too close. 

For more extreme weather conditions, it's advised to repeat the saying four or five times instead.

Variable speed limits in Ireland

Variable speed limits, similar to those used on our smart motorways, are due to hit roads in Ireland. Dublin’s M50 has been earmarked for an €80 million overhaul to install gantry signs that close lanes and reduce speeds in the event of a crash or severe weather.2

There are no plans to open up the hard shoulder for use as another driving lane.

National speed limits in Ireland

National speed limits work slightly differently in Ireland. There’s a difference between speed limits on national roads and the speed indicated by the ‘national speed limit’ road sign:

  • speed limit on national roads: 100 kph (62 mph)
  • national speed limit: 80 kph (49mph) 

The ‘national speed limit’ sign is almost identical to the one in the UK except that it uses a series of diagonal stripes on a white circle rather than the single black stripe that we’re used to.

Special speed limits in Ireland

Slower speed limits may be set by local authorities on roads in densely populated areas or outside schools. Keep an eye out for signs.

Periodic speed limits in Ireland

Although most speed limits in Ireland apply 24 hours a day, some local authorities may enforce limits between certain time periods and different days of the week. For example, you might find that a 30kph (18mph) limit applies Monday to Friday close to some schools.

The periodic speed limits are displayed in one of two ways:

  • a standard road sign with an information plate giving details of when the temporary rules apply.
  • an electronic sign which only lights up when the periodic limit applies. This may also feature two flashing amber lights.

Speeding fines in Ireland


If you’re caught speeding in Ireland, you’ll face an €80 fine and three points on your licence. You’ll have 28 days to pay the fine before it increases to €120 and a possible five points on your licence. If you fail to pay the fine after another 28 days and you’re convicted for speeding in court, you could face a maximum fine of €1,000.

Back in 2019, plans for graduated penalties were approved by the Irish Cabinet before being scrapped in 2021.3

Speed limits in Ireland - FAQs

  • Are you allowed to drive 10% over the speed limit in Ireland?

    Although police officers in the UK are advised to take enforcement action when speed limits are exceeded by 10% plus 2mph, there isn’t any firm evidence that a similar discretion applies in Ireland.

  • How much is a speeding ticket in Ireland?

    Speeding tickets in Ireland fine drivers €80 and increase to €120 after 28 days. If you fail to pay the fine after another 28 days and you’re convicted for speeding in court, you could face a maximum fine of €1,000.

  • How long do speeding fines take to arrive in Ireland?

    Speeding fines and penalty points are issued to drivers by post. They should arrive at a driver’s address well before the 28-day payment deadline.

  • Are there minimum speed limits in Ireland?

    According to the Road Safety Authority’s ‘Rules of the Road’ there doesn’t appear to be a minimum speed limit.

    Some counties require that tractors can reach a minimum speed of 50 kph (31 mph) on the motorway but this shouldn’t affect the average driver from the UK.

  • What is the national speed limit in Ireland?

    A national speed limit in Ireland could refer to the:

    • speed limit on national roads: 100 kph (62 mph)
    • national speed limit: 80 kph (49mph)

    The maximum speed limit of 120 kph (74 mph) applies on motorways only.

European Breakdown Cover

Get covered when driving in Europe from just £7.*

1. https://www.rsa.ie/Documents/Learner%20Drivers/Rules_of_the_road.pdf 
2. https://www.irishtimes.com/news/ireland/irish-news/dublin-s-m50-to-get-overhaul-with-overhead-gantries-and-variable-speed-limits-1.4549867
3. https://www.irishlegal.com/articles/plans-for-graduated-speeding-penalties-scrapped

*Based on 1 day cover in Zone 1, max 9 people in a vehicle up to 1 year old.