Ireland's weather does a lot of the theory test's work for it: rain, low winter sun, fog off the coast and the occasional hard frost all change how a car behaves and how far you can see. The single skill that ties this topic together is adjusting your speed and following distance to the conditions, and using the right lights so others can see you.
Rain and standing water
- Wet roads roughly double your braking distance, so at least double your following gap to four seconds.
- Aquaplaning happens when water builds up faster than the tyres can clear it and the car effectively floats on a film of water — the steering goes light and unresponsive. If it happens, do not brake or steer sharply: ease off the accelerator, hold the wheel steady, and let the speed drop until the tyres grip again. Good tyre tread and lower speed prevent it.
- Never drive into floodwater if you cannot see how deep it is. Even shallow moving water can push a car sideways, and deeper water can stall the engine. After driving through water, dry your brakes with gentle pressure.
Fog and poor visibility
- Slow down and increase your gap — you can only safely stop within the distance you can see to be clear.
- Use dipped headlights, and use rear fog lights only when visibility is seriously reduced (roughly under 100 m). Switch fog lights off when visibility improves — they dazzle drivers behind and can mask your brake lights.
- Do not use full-beam headlights in fog: the light reflects off the water droplets and bounces back at you, making things worse.
Ice and snow
- Ice can multiply braking distance up to ten times. Do everything gently — accelerate, brake, steer and change gear smoothly, because sudden inputs break traction.
- Watch for black ice on bridges, in shaded spots and in the early morning, where the road looks merely wet. If the steering feels eerily light and quiet, suspect ice and ease off.
- If the car skids, steer gently into the skid — if the back swings right, steer right — and avoid slamming the brakes. Look and steer where you want to go.
Night driving and dazzle
- Use dipped headlights in the dark and in poor daytime light. Use full beam on unlit roads only when it will not dazzle others, and dip for oncoming traffic and when following another vehicle.
- If an oncoming driver's lights dazzle you, slow down and, if necessary, stop — do not look straight at the lights; glance toward the left edge of the road to keep your bearing.
- At night, everything you cannot see is a potential hazard: unlit cyclists, pedestrians in dark clothing, animals on rural roads. Drive so you can stop within the range of your headlights.
- Low winter sun at dawn and dusk is a real Irish hazard — use your visor, keep the windscreen clean inside and out, and slow down when the sun is directly ahead.
Before you set off
In bad weather, spend a moment on the basics: clear all windows fully of ice, mist and dirt, check your lights and tyres, and top up washer fluid. A misted or iced-over window is not just uncomfortable — driving with obscured vision is an offence.
### Exam focus - Wet ⇒ double the braking distance and the following gap (4 s). - Aquaplaning: ease off, don't brake/steer sharply, let speed drop. - Fog: dipped lights, rear fog lights only under ~100 m visibility (off when it clears), never full beam. - Ice can multiply braking distance up to 10×; drive smoothly; steer into a skid. - Dip your headlights for oncoming traffic; if dazzled, slow or stop and look to the left edge.