Driver Safety · Autumn & Winter

Get Your Car Ready for Winter — the Irish Checklist

Tyres, wipers, screenwash, lights, coolant, battery and what to keep in the boot. An hour on these checks in October makes the dark, wet months ahead a lot safer. Every fact below is sourced, mostly from the RSA, the Rules of the Road and the NCT manual, and the full list is at the end.

📅 Published 5 October 2026❄️ Winter⏱ 12 min read

In short

Tyres: the Rules of the Road sets a minimum of 1.6 mm of tread for most vehicles and strongly recommends considering new tyres at 3 mm. Check the pressure of every tyre monthly, the spare included, using the label on the driver's door pillar or fuel flap.
Following distance: two seconds in the dry and four in the wet are the absolute minimum. In winter, leave more.
Wipers and washers: replace blades as soon as they smear. Use a screenwash with antifreeze in the washer bottle, and never engine coolant.
Lights: check every bulb and clean every lens. Cloudy, yellowed headlamps throw much less light and are worth restoring or replacing.
Dark evenings: the clocks go back on Sunday 25 October. Daytime running lights don't light the back of the car, so switch on dipped headlights at lighting-up time.
Coolant and battery: check the coolant level when the engine is cold and have the antifreeze strength measured. Harsh winter conditions reduce a battery's capacity, so have it checked at the service.
In the boot: scraper and de-icer, hi-vis vest, torch, warning triangle, first aid kit, warm clothes, and a charged phone.

🍂

Why Do It Now, in Autumn

Darker evenings, wet leaves and the first frosts all arrive before the real cold does.

On Sunday 25 October 2026 the clocks go back an hour. EU law ends summer time on the last Sunday in October, and for many people the drive home moves into dusk and darkness from that week on. The Rules of the Road defines lighting-up hours as the period from half an hour after sunset to half an hour before sunrise (RotR p. 278), and in winter that covers a large part of the day.

Autumn also brings its own grip problem. The Rules of the Road lists leaves alongside wet roads, mud, ice, snow and worn or badly inflated tyres as things that can cause or contribute to a skid (RotR p. 125).

The RSA's starting point: get the car serviced before winter so it is fit for winter driving, and do regular walk-around checks yourself. The RSA's car safety booklet suggests walk-around checks at least once a week and before any long journey.

Learner drivers, take note. Every check on this page also comes up in the driving test. The Rules of the Road says you'll be asked to demonstrate technical checks such as tyres, oil, washer fluid, coolant and lights, and to work secondary controls such as wipers, washers, de-misters and the rear window heater (RotR p. 38). See our Tell Me & Show Me guide.

🛞

Tyres: What the Rules of the Road Says

Everything in this section comes from the current Rules of the Road (Revision No. 9, May 2026), with page numbers, unless it is marked otherwise.

1.6 mm

Minimum tread over the main tread (most vehicles)

3 mm

When the book strongly recommends considering new tyres

121 m

Minimum stopping distance at 100 km/h in the wet (70 m dry)

€80 + 2

Fixed charge & penalty points for worn tyres

Check regularly (RotR p. 41)

Tread depth. Don't let your tyres wear down too much. Most vehicles must have at least 1.6 mm of tread over the main tread, and the book strongly recommends considering new tyres when they reach 3 mm.
Pressure. Check the pressure of every tyre regularly, including the spare, and use the manufacturer's specification for the correct pressure.
Damage. Look for cuts, cracks and bulges, which could cause an unexpected blow-out.
Before you get a flat. Make sure you know how to change a wheel, and that you have a spare wheel and repair kit to hand.

Replacing tyres and spares (RotR p. 41)

New and e-marked. Only fit new, e-marked tyres bought from a reputable dealer.
Same on each axle. Don't mix radial and cross-ply tyres on one axle. Tyres must be the same on any axle.
Space-saver or repair kit. Use it only to finish the journey or to get to a tyre dealer, and never above the speed stamped on the tyre.
Second-hand tyres. The book says they can be risky and should be avoided, because there is no history of how they have been used or abused.

Why tread and pressure matter in winter. The book lists tyre pressure, tread and grip among the things that decide how well your car brakes (RotR p. 123), and names worn or badly inflated tyres alongside wet roads, leaves, ice and snow as causes of skids (RotR p. 125). Before a long motorway journey, it tells you to check that the tyre pressures are correct (RotR p. 156).

Why tyre pressure matters

Control and braking. Tyre pressure is one of the things that decide how well your car brakes (RotR p. 123), and badly inflated tyres are listed among the causes of skids (RotR p. 125). Under-inflation also reduces the tyre's grip (SEAI).
Tyre wear. Under-inflation causes premature wear (SEAI), and the wrong pressure shows up as uneven wear on the tread (RSA tyre safety guide). Correct pressure means longer tyre life.
Fuel. Under-inflation increases rolling resistance, which means higher fuel costs, or less range in an electric car (SEAI).
Load. The air inside the tyre has to carry the weight of the car and its load, so the right pressure depends on the car and on how heavily it is loaded (RSA tyre safety guide).
How often. A tyre can lose about 1 psi a month, so check the pressures monthly (SEAI) and before a long motorway journey (RotR p. 156). If the tyre pressure warning light comes on, check and inflate all the tyres (RSA).

Where to find the right pressures

On a label in the car. Look on the driver's door pillar (open the door) or on the back of the fuel filler flap. The figures are also in the owner's handbook (RSA tyre safety guide).
What the label shows. It gives pressures for the tyre sizes fitted at the factory and for different loads, and on some cars for sustained high speed as well (manufacturer's manual, e.g. Polestar).
Pick the right line. Read the size on your tyre's sidewall (for example 205/55 R16) and use the line for that size. Use the full-load figure when the car is full of people and luggage.
Size not on the label? If your car has wheels or tyres in a size the label doesn't list, check the handbook or ask a tyre dealer for the correct pressure.
Use a gauge. The RSA recommends regular checks with an accurate pressure gauge.

Speed	Minimum stopping distance, dry	Minimum stopping distance, wet
50 km/h	25 m	36 m
60 km/h	33 m	49 m
80 km/h	52 m	81 m
100 km/h	70 m	121 m
120 km/h	102 m	169 m

The RSA's recommended minimum stopping distances, from Tables 5 and 6 of the Rules of the Road (pp. 123–124), based on Transport Research Laboratory figures. The book says these are absolute minimums and the average stopping distance can be significantly longer (p. 125).

Two seconds is the floor, not the target. The Rules of the Road says to stay at least two seconds behind the vehicle in front, to double that in the wet, and that in snow, fog and ice you may need four or five times the gap (RotR p. 115). It also says never to drive closer than the two-second rule allows (RotR p. 116). Treat two seconds in the dry and four in the wet as an absolute minimum, and leave extra margin in winter, when the road is dark and slippery and your tyres may be worn. Not leaving an appropriate distance is an offence in itself: €160 and 3 penalty points (RotR p. 267). How to measure the gap, and why two seconds is less than it sounds: The Two-Second Rule: Safe Distance or Absolute Minimum?

The penalty. Using a vehicle with defective or worn tyres carries a fixed charge of €80 (€120 if paid in the next 28 days) and 2 penalty points, or 4 points on conviction in court (RotR Appendix 4, p. 265). Driving a dangerously defective vehicle is a separate offence with a mandatory court appearance and 5 penalty points on conviction (RotR p. 267). The RSA's tyre safety guide says a conviction for driving with dangerous tyres can bring a fine of up to €5,000, a 3-month prison sentence, or both.

Not in the Rules of the Road: winter tyres and other questions

The book doesn't cover winter tyres. These answers come from the tyre FAQs on the RSA's website.

There is no law in Ireland requiring or banning winter tyres. If you fit them, the RSA advises a full set of four, to reduce the risk of oversteer and understeer, and swapping back once the chance of snow has passed.
M+S doesn't automatically mean winter. M+S tyres come in summer and winter versions. A winter tyre also carries the snowflake-in-a-mountain symbol.
Snow chains, snow socks and studded tyres are not illegal, but they must be fitted to the manufacturer's specifications.
A quick tread check: run a €1 coin along the centre of the tyre. If you can see the gold band, the tread may be close to the legal limit, so get it checked.
Age: tyres over six years old don't fail the NCT if the tread and condition are fine, but they get a pass advisory.
Buying tyres: on the EU tyre label, a tyre with an E wet-grip rating needs an extra 18 metres to stop in the wet compared with an A-rated tyre.

🔬

Does Worn Tread Really Matter in the Rain?

What test-track and crash research says about tread depth and water.

The grooves in a tyre give water a way out from under the tyre. As the tread wears, there is less room for that water to escape. Research shows it doesn't happen at an even rate:

What the research found

Summarised from the papers listed in the sources at the end of this page.

It isn't a straight line. A 1976 review from Delft University of Technology brought together British, German and Dutch measurements. How much grip a tyre loses as it wears depends strongly on speed and on the road surface. In the British tests there was, under some conditions, a very sharp drop in braking grip once the tread fell below 1 to 2 mm. The German cornering tests showed a gradual decline with no single point where grip fell away.
Water depth and speed matter most. A 2002 SAE paper notes that a tyre's ability to clear water depends heavily on tread depth, water depth and speed, and that grip changes significantly even before full aquaplaning sets in.
On a merely wet road the difference can be small, until the tyre is nearly bald. In a 2026 SAE study of 216 ABS stops in an SUV, average wet deceleration barely changed between 7.1 mm and 2.4 mm of tread on a road wetted by a water truck, but it was lower at 0.8 mm.
Where the worn tyres are fitted matters. The same 2002 paper found that the front-or-rear placement of low-tread tyres changed how the car handled in wet manoeuvres.
Crash records point the same way. American studies summarised in the 1976 review found that tyres with very little tread were involved in wet-road crashes far more often than their share of tyres on the road would suggest.
Even new tyres can aquaplane. Roadcraft, the police driver's handbook (2025), says aquaplaning can often be put down to thin or worn tread, but it can also happen with brand-new tyres if the grooves can't clear the water fast enough, and wider tyres are more likely to aquaplane.

What this means for you: worn tread costs you the most where Irish winter roads are at their worst: standing water, spray and higher speeds. The Rules of the Road's 3 mm recommendation keeps a margin for exactly those conditions. Whatever your tread, slow down in heavy rain. The Rules of the Road explains that in aquaplaning the car loses contact with the road and braking and steering are affected (RotR p. 125).

🌧️

Wipers, Screenwash and Demisting

If you can't see out, nothing else on this list matters.

The Rules of the Road asks you to keep your wipers and wiper blades in good working condition and your washer liquid topped up (RotR p. 44). In winter, both work harder than at any other time of year.

Wiper blades

The RSA says to replace blades as soon as they start to smear rather than clean the glass.
Signs a blade is worn: lines or streaks, noise, judder, and lifting off the glass at speed (RSA car safety booklet).
Check the rear wiper too, if your car has one.

Screenwash

Top up regularly. The RSA says an additive containing an antifreeze agent, used as the manufacturer recommends, is needed to stop the system freezing.
Never put engine coolant or antifreeze in the washer bottle (RSA car safety booklet), and don't use washing-up liquid (RSA severe weather advice).
Use a funnel so the fluid doesn't spill onto other parts of the engine bay (RSA).

Test the demisting equipment before you need it. The RSA calls the windscreen demister, the washer pump and the rear window heater essential for good visibility, so check that all three work. Get to know your car's heating and ventilation controls so you can keep all the glass clear without fumbling on a cold, wet morning.

💡

Lights, Lenses and Cloudy Headlamps

To see, and to be seen, through the darkest months.

Your car must have, at the front, two headlights, two sidelights and amber indicators, and at the back two tail lights, two brake lights, two red reflectors, number plate lighting and amber indicators (RotR p. 42). They only work properly if you keep them clean and in good working order (RotR p. 43).

The ten-minute light check

Dipped beam, main beam, sidelights and daytime running lights.
Indicators and hazard lights, front and back.
Brake lights and reversing lights. Ask someone to stand behind the car, or check the reflection in a shop window.
Fog lights and the number plate light.
Clean every lens, and replace any damaged ones (RSA car safety booklet).

Cloudy or yellow headlamps

Plastic headlamp lenses deteriorate over time, mainly from sunlight (UV) and road grit (AAA, 2018).
In AAA's laboratory tests, badly deteriorated headlamps produced only 22% of the low-beam light of new ones.
Restoring the lenses, either professionally or with a DIY kit, brought them back to about 70% of a new headlamp. New replacement units did best.
The NCT checks the condition of the headlamp glass and reflectors. Light intensity that isn't acceptable is a major defect (NCT Manual 2023, 4.1.1).

The daytime running light trap. Daytime running lights are only suitable for daylight hours and don't light the road ahead (RotR p. 64). The RSA adds that when they're on, your rear lights and instrument lights may be off in some cars. On a dark October evening you could be driving with no lights showing at the back at all. Switch on dipped headlights at lighting-up time (RotR p. 43, p. 64), and if your car has automatic lights, check what they actually switch on.

Headlamp aim

Keep your headlights properly adjusted. If they are out of line, they are less effective and may dazzle oncoming traffic even when dipped (RotR p. 63).
If your car has a manual headlamp levelling dial, adjust it when the car is heavily loaded, as your handbook describes.

Fog lights

Use them only in dense fog or falling snow, and turn them off at all other times (RotR p. 43, p. 64).
Check now that they work and that you know where the switch is. Where fog lights are fitted, they must work or the car fails the roadworthiness test (RSA).

🔋

Coolant, Oil, Battery and Warning Lights

The under-bonnet checks that keep you from a cold roadside wait.

Coolant and antifreeze

Check the level when the engine is cold. It should sit between the minimum and maximum marks on the coolant tank (RSA car safety booklet).
Never open the cap when the engine is hot. It can cause injury (RSA).
Top up only as the manufacturer specifies. The handbook gives the correct coolant or antifreeze and the concentration to use (RSA).
Have the strength of the coolant/antifreeze measured before winter (RSA, Top 10 tips for snow and ice). A garage can do this at the service.

Battery

The RSA says worn-out and flat batteries are reported as one of the most common causes of breakdowns in Ireland.
In harsh conditions a battery's capacity drops, and so does its ability to take a charge. The car may then be slow to start or not start at all (RSA car safety booklet).
Ask for the battery to be checked at the next service, and listen for a weak battery when starting (RSA; Be Winter-Ready).

Engine oil

Check the dipstick. The level should be between the minimum and maximum marks, and the handbook says which oil to use (RSA car safety booklet).
Look for signs of leaks on the ground under the car (Be Winter-Ready).
The RSA's winter advice is to make sure the oil viscosity suits cold conditions. Your garage and your handbook will tell you the right grade.

Warning lights

Check the dashboard before and after you start the engine (Be Winter-Ready).
As a general rule, yellow means check as soon as possible and red means stop as soon as it is safe to do so (RSA car safety booklet).
If you don't recognise a symbol, look it up in the handbook.

Fuel. The RSA's winter advice is simple: make sure you have enough fuel for the journey. In snow, a long tailback or a diversion, a near-empty tank leaves you with very few options.

🧊

Ice, Snow and Clear Glass

Frosty mornings are where good intentions meet a ten-minute delay.

The Rules of the Road asks you to keep your windscreen and windows clean so you can see the road and other road users clearly, and your mirrors clean and correctly positioned (RotR p. 44). A clean windscreen is especially important at night (RotR p. 63), and the inside of the glass counts as much as the outside.

1. Clear all of it. Clear all the windows and mirrors before you set off, using a scraper and de-icer (RSA). A small peep-hole isn't enough.

2. No hot water. Don't pour hot water on the windscreen, as it can crack the glass (RSA).

3. Snow off the roof too. Remove all snow from the car. Snow left on the roof can slide onto the windscreen when you brake, or fall off as you drive and injure a pedestrian or startle another driver (RSA severe weather advice).

4. Lights and plates. Make sure your lights are clear of snow (RSA), and wipe the number plates.

5. Demist the inside. De-mist the inside of the windows thoroughly before moving off (RSA).

Keep sunglasses in the car. The RSA's winter advice is to wear sunglasses when the low winter sun is dazzling. A clean screen, inside and out, makes a big difference too. More on that in Driving Into Low Winter Sun.

🧰

What to Keep in the Car This Winter

The RSA's lists, combined into one.

All year round

First aid kit
At least one high-visibility vest or jacket
At least one red warning triangle
A torch (and check that it works)
A small fire extinguisher

The RSA's list of useful items to carry (RotR pp. 40–41).

Add for winter

De-icing equipment for the glass and the door locks, and an ice scraper
Spare bulbs and fuses
Warm clothes, a blanket and boots in case you have to leave the car
Some food and water
A charged mobile phone and a way to charge it
In prolonged snow and ice: a tow rope and a shovel
Know your Eircode, so you can tell emergency services where you are

From the RSA's car safety booklet, its Top 10 tips for snow and ice, and the Be Winter-Ready booklet.

Before a long winter journey, check the forecast and road conditions and give someone an idea of when you expect to arrive (RSA). Our winter driving guide covers ice, fog, flooding and what to do if you break down in the cold.

✅

The One-Page Checklist

Print it or screenshot it, and work through it one weekend in October.

Check	What to look for	Source
Service	Book one before winter if it's due, and ask for the battery and coolant strength to be checked	RSA
Tread depth	At least 1.6 mm over the main tread; consider new tyres at 3 mm	RotR p. 41
Tyre pressure	All four plus the spare, monthly, to the label on the door pillar or fuel flap (the line for your tyre size and load)	RotR p. 41; RSA; SEAI
Tyre condition	Cuts, cracks, bulges; tyres the same on each axle	RotR p. 41
Spare / repair kit	Spare to hand and inflated; you know how to change a wheel	RotR p. 41
Wiper blades	Replace if they streak, judder, squeak or lift	RotR p. 44; RSA
Screenwash	Full, with an antifreeze screenwash; never engine coolant	RSA
Demisting	Front demister, rear window heater and washer pump all work	RSA
All lights	Every bulb works; lenses clean; damaged lenses replaced	RotR pp. 42–43; RSA
Headlamp lenses	Not cloudy or yellow; restore or replace if they are	AAA; NCT Manual
Daytime running lights	You know how to switch on dipped headlights, and do so at lighting-up time	RotR p. 64; RSA
Coolant	Level between the marks with the engine cold; strength measured	RSA
Engine oil	Between the dipstick marks; no leaks under the car	RSA
Warning lights	None left on after starting; yellow = check soon, red = stop safely	RSA
Following distance	At least 2 seconds dry and 4 seconds wet, and more in winter	RotR pp. 115–116
Winter kit	Scraper, de-icer, hi-vis, torch, triangle, first aid kit, warm clothes, phone	RotR pp. 40–41; RSA

RotR = Rules of the Road, RSA, Revision No. 9 (May 2026). Page numbers are the printed page numbers.

Not confident driving in the dark or the rain?

A prepared car is half of it. The other half is driving it well on a black, wet evening. Book a lesson and tell your instructor what you want to work on.

Book a Lesson Refresher Lessons

Driving lessons in Lucan · Tallaght · Clondalkin · Adamstown · Celbridge · Maynooth · Leixlip · all areas

Sources

📘 Rules of the Road, Road Safety Authority, Revision No. 9, May 2026 (law as at 1 March 2025): p. 38 (driving test checks), pp. 40–44 (vehicle safety, tyres, lights, windscreens), pp. 63–64 (lights at night, daytime running lights, fog lights), pp. 115–116 (two-second rule), pp. 123–125 (stopping distances, skidding, aquaplaning), p. 156 (motorway journeys), pp. 265–267 (Appendix 4, penalty points), p. 278 (lighting-up hours).
📋 RSA, Car maintenance, and the RSA booklet Car Safety Checks: Basic Vehicle Maintenance Checks (RSA and SIMI, June 2018).
📋 RSA, Severe weather: "Is your vehicle ready for winter?", Top 10 Safety Tips for Driving in Snow and Ice, Severe Weather Advice for Road Users (2009), and the Government's Be Winter-Ready booklet (Office of Emergency Planning).
📋 RSA, Tyres: buying tyres, wheel and tyre maintenance, performance labelling, spare wheels, and the RSA booklet Your Guide to Tyre Safety.
📋 SEAI, Tyre label guide for consumers (October 2024): tyre inflation, rolling resistance and wear.
📋 Polestar 2 owner's manual, "Recommended tyre pressure", as an example of what a tyre pressure label shows.
📋 RSA, Vehicle lighting: daytime running lights, fog lights, HID headlights.
📋 National Car Test (NCT) Manual 2023, section 4.1.1, Headlamps: condition and operation.
🔬 AAA (American Automobile Association), Headlamp Lens Deterioration, December 2018.
🔬 Dijks, A. (1976). Influence of tread depth on wet skid resistance of tires. Transportation Research Record 621.
🔬 Blythe, W. et al. (2002). Single vehicle wet road loss of control: effects of tire tread depth and placement. SAE Technical Paper.
🔬 Miller, I. et al. (2026). The effect of tire tread depth on antilock-brake system (ABS) decelerations on dry and wet asphalt and concrete road surfaces. SAE Technical Paper Series.
📘 Roadcraft: The Police Driver's Handbook (2025), chapter 8, Aquaplaning.
⚖️ Directive 2000/84/EC on summer-time arrangements, Article 3 (summer time ends on the last Sunday in October).
🇵🇱 Wersja polska tego artykułu