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Difficulty: Very hardFactors Affecting Braking Distance

If your vehicle's tyre tread depth is worn down to the legal minimum of 1.6mm, your braking distance on a completely dry, clean tarmac road will be significantly longer compared to using new tyres with 8mm of tread.

Answer: Answer

Answer

False
Tyre tread is essential for gripping wet roads because it disperses water. However, on a completely dry, clean surface, a tyre with 1.6mm of tread still maintains a massive amount of rubber-to-road contact. Consequently, the braking distance will not be significantly longer than with a new tyre. The extreme danger of low tread depth lies in wet conditions, where the braking distance would dramatically and dangerously increase.

Step-by-Step Solution

1
Analyze the environmental conditions specified in the scenario.
The scenario explicitly states the road is 'completely dry' and 'clean tarmac', comparing minimum legal tread (1.6mm) to new tread (8mm).
Environmental factors dictate how the vehicle's components interact with the road surface.
2
Recall the physical purpose of tyre tread grooves.
Tyre tread is designed to act as channels to clear water away from the contact patch, maintaining grip in wet conditions.
Understanding the mechanical function of the tread is necessary to evaluate its impact on braking.
3
Evaluate the impact of worn tread specifically on a dry surface.
Because there is no water to disperse on a dry road, a tyre with less tread puts a large, uninterrupted block of rubber in contact with the tarmac. Therefore, the braking distance is not significantly increased.
Applying physical principles to the specific dry conditions provided isolates the true factor affecting the braking distance.

Key Concept

Tyre tread primarily affects braking distance in wet conditions by clearing water; on dry roads, its impact on braking distance is minimal.
Estimated Time:1m 0s
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Factors Affecting Braking Distance

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