Aquaplaning and winter driving

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Aquaplaning and winter driving: recognising the risk, reacting without sharp steering input and choosing the right tyres.

Cover, Aquaplaning and winter driving

Lesson objectives

Understand the mechanisms of aquaplaning and ice to adapt your speed Master braking and control techniques in winter conditions Know the essential equipment and precautions for safe driving in bad weather

Aquaplaning: when water takes control

Aquaplaning occurs when a layer of water comes between the tyre and the road: the tyre no longer evacuates enough water, it "floats" and loses contact. Steering and braking become ineffective until contact is restored. Three factors trigger it, and you control two of them: the water depth , ruts, puddles, road edges; the tread depth of the tyre: this is what evacuates the water, and the legal minimum of 1.6 mm, set by the technical regulations, to which article 81.1.1 refers, is a floor, not a comfort level; speed , whose effect is the most brutal. The right reaction: ease off the accelerator without braking or turning the wheel , keep the steering wheel straight, and wait for the tyres to regain the road.

Aquaplaning on wet road

Reduce your speed as soon as the road is very wet. The slower you drive, the less risk of aquaplaning. Avoid visible puddles and ruts that accumulate water.

A15

A15, Slippery road. The road can be particularly slippery in case of rain, ice, gravel or fallen leaves. Avoid harsh braking and sudden steering movements. Increase safety distances and adapt your speed to conditions.

A17

A17, Gravel projection. The road has been recently resurfaced. Small stones may be thrown up by wheels. Slow down to avoid damaging your windscreen and that of vehicles following you. Keep a good distance.

Ice: the invisible enemy

Ice makes the road extremely slippery. On an icy road, tyre grip is drastically reduced. You must adapt your driving accordingly: reduce your speed well before entering a bend and avoid any sudden steering or pedal movement.

Icy road in winter conditions

A1a

A1a, Dangerous left-hand bend. This sign announces a left-hand bend considered dangerous, either by its radius or its visibility. Before entering it, slow down. Stay well in your lane and avoid overtaking. A vehicle may appear head-on at the exit of the bend.

A1b

A1b, Dangerous right-hand bend. This sign announces a right-hand bend considered dangerous. Slow down well before entering it, keep your vehicle in your lane and remain vigilant at the exit, as a vehicle may appear head-on if it has cut its bend.

Braking in winter conditions: the right technique

On ice or slippery road, never brake harshly . If your car is equipped with an ABS system (Anti-lock Braking System), you must brake firmly and maintain pressure on the brake pedal without pumping it. ABS automatically modulates the pressure to prevent wheel lock.

With ABS, do not pump the pedal . Press hard and maintain. The system handles the rest. If you pump, you deactivate ABS and increase the risk of skidding.

What to do in case of skidding?

In case of skidding, the instinctive reaction, braking hard, or turning the wheel the opposite way, makes everything worse. The technique: gently ease off the accelerator , without harsh braking; steer in the direction the rear of the vehicle is moving , what is called "counter-steering" or "steering in the direction of the skid". In practice, this means directing your gaze and the wheels towards where you want to go , never towards the obstacle; straighten up gradually once the vehicle is back in line, otherwise the skid will start again in the opposite direction. On a vehicle equipped with ESP , the system corrects itself by braking individual wheels, it reduces the extent of the skid, it does not eliminate the laws of grip.

Stay calm. Sudden steering wheel or brake movements make the skid worse. Be gentle and progressive in your actions.

Reduce speed before the bend

On a slippery road, you must slow down significantly before entering a bend , not while you are turning. Braking in the middle of a bend on a slippery road causes loss of grip: braking and steering forces combine and exceed the grip limits of the tyres.

A3

A3, Dangerous descent. The road will go down steeply. A percentage indicates the slope, for example ten per cent. Downshift before the descent to use engine braking and keep a good distance from the vehicle in front. Avoid continuous braking, as the brakes may overheat.

A5

A5, Steep climb. A significant hill awaits you. Downshift to maintain power and be patient, as heavy vehicles and buses may travel much more slowly. Do not attempt to overtake blindly at the top of the hill.

Winter equipment: tyres and chains

Winter tires are not mandatory in Belgium , this is the point the exam verifies. The code does not impose any seasonal equipment; it only requires, by article 81.4 , tires compliant with technical regulations and in good condition. The rest is a matter of advice, and. The 7 °C threshold is the point below which winter rubber becomes more effective than summer rubber; fitting all four tires rather than two avoids an imbalance in grip between the axles. No mounting or removal date is set by any regulation.

Snow chains

Anti-slip chains: article 81.4.4 is explicit, 'Tires may only be fitted with anti-slip chains in case of snow or ice.' No calendar period applies: it is the road surface condition that determines this. The same article prohibits studded tires, except for exceptional ministerial authorization justified by atmospheric circumstances.

Lights and visibility in winter conditions

Two different thresholds: 200 meters , as soon as it is no longer possible to see clearly for approximately 200 m, dipped headlights (or main beam) at the front and red lights at the rear are mandatory, day and night (art. 30 ). A snowfall that reduces visibility to 150 m therefore already requires dipped headlights. 100 meters , rear fog lights become mandatory in case of fog or snowfall reducing visibility to approximately less than 100 m, as well as in case of heavy rain (art. 30.1, 2°). And they are prohibited in other circumstances .

A31

A31, Works. Construction work is in progress on the roadway or nearby. Reduce your speed, comply with temporary signage and be alert to workers and construction vehicles that may enter or exit the perimeter.

A50

A50, queues, frequent congestion. This area is subject to sudden stops and vehicle queues. Anticipate by easing off as soon as you see the sign. Increase your distance from the vehicle ahead and prepare for gradual braking.

Key points to remember

Aquaplaning : ease off, do not brake, do not steer, keep wheel straight. Prevention: speed and tread depth. Black ice : slow down before the bend, braking in the middle of a bend combines two grip demands. ABS : press hard and maintain ; do not pump. ABS preserves direction but does not always shorten stopping distance. Skid : release the accelerator, steer towards where the rear is sliding, look where you want to go, straighten up gradually. Winter tires : not mandatory in Belgium; recommended below 7 °C, and on all four wheels. Chains : only in case of snow or ice (art. 81.4.4). Studded tires prohibited , except for exceptional ministerial authorization. Lights : dipped headlights when visibility falls below 200 m ; rear fog lights below 100 m in snow or fog, and in heavy rain, prohibited otherwise.

What now?

First do the quiz for this lesson to validate your learning, then practice on the exam simulator and multiple-choice questions . Next lesson: Fog and violent winds .

BelgianLicenses

Theory without practice is forgotten: follow up with multiple-choice questions to durably anchor your learning.