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Difficulty: MediumTyre Safety and Requirements

Safe vehicle operation relies on strict adherence to legal standards and correct servicing practices. Which UK regulatory standard or maintenance procedure correctly corresponds to each tyre condition or scenario?

  • Operating a car fitted with a temporary space-saver spare wheelObey a maximum operational speed of 50 mph (80 km/h) for temporary use only
  • Measuring the minimum statutory tread depth on a passenger carMaintain at least 1.6 mm across the central three-quarters and around the entire outer circumference
  • Conducting a regular tyre pressure inspectionCheck readings using an accurate gauge when the tyres are completely cold
  • Preparing tyre pressures for a fully laden car carrying extra passengers and cargoInflate tyres to higher manufacturer-recommended pressures specified in the handbook

Answer

Operating a car fitted with a space-saver wheel pairs with obeying a maximum speed of 50 mph (80 km/h); measuring statutory car tread depth pairs with maintaining at least 1.6 mm across the central three-quarters and entire outer circumference; conducting regular pressure checks pairs with checking readings when tyres are cold; and preparing for a fully laden vehicle pairs with inflating tyres to higher manufacturer-recommended pressures.
Each requirement represents an essential UK statutory rule or DVSA maintenance procedure: temporary spare wheels have a strict 50 mph maximum speed limit; cars must maintain 1.6 mm of tread depth across the central three-quarters of the tyre and around the whole circumference; tyre pressures must always be checked cold to avoid false readings caused by friction-induced heat; and vehicle tyre pressures must be increased when transporting heavy loads as specified in the vehicle handbook.

Step-by-Step Solution

1
Identify the operational limitations placed on temporary space-saver wheels.
Matched with the 50 mph (80 km/h) emergency speed restriction.
Space-saver wheels are narrower and have different handling characteristics than standard road wheels.
2
Recall UK statutory minimum tread depth requirements for cars and light passenger vehicles.
Matched with the 1.6 mm minimum across the central three-quarters of the breadth and circumference.
This legal standard ensures adequate water clearance to prevent aquaplaning.
3
Identify the standard physical condition under which tyre pressures must be measured.
Matched with checking tyre pressure when tyres are cold before journey friction raises internal temperatures.
Warm tyre readings give falsely elevated pressure levels, which could lead to under-inflation if air is released.
4
Determine the required vehicle adjustment when carrying heavy luggage and full passenger capacity.
Matched with increasing inflation pressures in line with the vehicle handbook.
Increased pressure supports the extra mass, maintains proper contact patch geometry, and ensures stable handling.

Key Concept

UK legal tyre requirements, thermal measurement conditions, and payload pressure adjustments
Estimated Time:1m 0s
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Topics

Tyre Safety and Requirements

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