🎓 Prepared by students from Boğaziçi University

What is Wet Road Driving and Aquaplaning?

Wet road driving requires reduced speed and increased following distance. Aquaplaning (hydroplaning) is a dangerous condition where tires ride on water film instead of road surface, causing loss of grip.

Short answer

Aquaplaning is tire loss of contact with road due to water film pressure; it reduces braking and steering control. Prevention: lower speed, reduce pressure, and avoid puddles.

Safe Wet Road Driving

1
Reduce speed
Lower speed increases tire-road contact and water drainage
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2
Increase distance
Double or triple following distance on wet roads
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3
Smooth steering
Avoid sharp turns; gradual input maintains water drainage
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4
Avoid standing water
Watch for puddles and deep water; steer around

Step-by-step worked examples

You encounter a deep puddle on a wet road at 60 km/h. What do you do?

1. Spot puddle in advance; reduce speed BEFORE entering
2. Turn wheels straight (avoid turning while hydro-planing)
3. Drive through puddle slowly and steadily
4. Brake gently after exiting (water may have reduced grip)
5. Allow brakes to dry slightly before harder braking

Your car starts aquaplaning on a wet highway. How to recover?

1. Recognize loss of steering feedback (wheel feels light)
2. Ease off accelerator and brakes completely
3. Keep steering wheel straight
4. Wait for tires to re-contact road (typically 1-2 seconds)
5. Regain control; reduce speed and increase following distance

Compare braking distance on wet vs. dry road at 80 km/h.

1. Dry road braking distance: ~60 m
2. Wet road braking distance: ~90–100 m (50% longer)
3. Poor tire tread increases wet distance even further
4. Always allow extra stopping margin on wet roads

Flashcards

Quick quiz

Q1.Aquaplaning is caused by…

Correct answer: B. Aquaplaning occurs when tires can't push water away and ride on a water film.

Q2.If you start aquaplaning, what's the first action?

Correct answer: C. Easing off accelerator and brakes reduces engine/brake force and allows re-contact.

Q3.Braking distance on wet road vs. dry is roughly…

Correct answer: C. Wet conditions reduce tire grip by ~30-50%, increasing braking distance accordingly.

Q4.Minimum tire tread for safe wet driving?

Correct answer: C. Legal minimum is 1.6 mm; less than this greatly increases aquaplaning risk.

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Common mistakes

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Ignoring wet road warning signs and driving at normal speed. — Correct: Reduce speed 10-20% and double following distance.

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Braking hard during aquaplaning. — Correct: Release brakes; hard braking worsens aquaplaning.

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Turning sharply to avoid puddles while at speed. — Correct: Slow down first, then steer; sharp turns at speed invite aquaplaning.

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Relying on ABS to save you during aquaplaning. — Correct: ABS requires road contact; aquaplaning has none. Prevention is key.

FAQ

What is wet road driving?

Driving with reduced speed and increased distance due to reduced tire grip and braking power.

What is aquaplaning?

Hydroplaning — tires riding on water film, losing road contact and control.

How do you prevent aquaplaning?

Maintain tire tread (>1.6 mm), reduce speed, and avoid standing water.

Is aquaplaning more dangerous than skidding?

Yes — you have zero road contact, so brakes and steering don't respond.