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Difficulty: EasyTyre Safety and Requirements

To obtain the most accurate pressure reading, when should you check your vehicle's tyres?

  1. A
    Immediately after driving at high speed on a motorway
  2. When the tyres are cold before starting a journeyAnswer
  3. C
    Only when the tread depth has worn down to 1.6 mm
  4. D
    After driving for at least thirty minutes to warm the rubber

Answer

When the tyres are cold before starting a journey
Tyre pressures should be checked when the tyres are cold, prior to driving. As a vehicle travels, friction between the road and tyres creates heat, which causes the air inside to expand and shows an artificially high pressure reading on a gauge.

Step-by-Step Solution

1
Identify the factor that causes tyre pressure readings to fluctuate.
Friction and heat generated during driving expand the air inside the tyre, raising the internal pressure.
Manufacturer pressure specifications are calibrated for ambient temperature before heat builds up.
2
Determine the required condition for accurate tyre pressure measurement.
Tyre pressures must be checked when cold before any significant driving occurs.
Checking when cold avoids falsely elevated pressure readings and ensures correct inflation.

Key Concept

Tyre pressure inspection under cold conditions
Estimated Time:40s
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Topics

Tyre Safety and Requirements

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