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Difficulty: EasyTyre Safety and Requirements

Match each tyre condition or feature on the left with its corresponding effect or operational rule on the right.

  • Under-inflated tyreCauses excessive wear along the outer edges of the tread
  • Over-inflated tyreCauses accelerated wear along the centre of the tread
  • Tread wear indicator (TWI)Shows when the tread depth has worn down to the legal minimum limit
  • Space-saver spare wheelImposes a restricted maximum driving speed for emergency, temporary use

Answer

Under-inflated tyre matches with excessive wear along outer edges; over-inflated tyre matches with accelerated wear along the centre; tread wear indicator matches with showing when tread depth reaches the legal minimum limit; space-saver spare wheel matches with imposing a restricted maximum driving speed for emergency, temporary use.
Each tyre condition or feature has a distinct consequence: under-inflation causes excessive shoulder wear, over-inflation wears the central tread band, tread wear indicators reveal when the tread reaches the legal minimum of 1.6 mm, and space-saver spare wheels carry strict speed and range limits for temporary emergency use.

Step-by-Step Solution

1
Identify the physical wear patterns resulting from incorrect tyre inflation pressures.
Under-inflation concentrates contact pressure on the tyre shoulders (outer edges), whereas over-inflation causes bulging that concentrates wear down the centre line.
Tyre pressure determines the shape and distribution of the contact patch across the road surface.
2
Identify the functions and restrictions of vehicle tyre safety equipment.
Tread wear indicators visually mark the 1.6 mm statutory limit, while space-saver spare wheels are strictly limited in speed and distance for emergency use.
These safety standards ensure legal compliance and safe emergency operation.

Key Concept

Tyre pressure wear patterns, tread wear indicators, and temporary spare wheel restrictions
Estimated Time:45s
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Topics

Tyre Safety and Requirements

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