While carrying out a routine inspection of your vehicle, you notice that the tread pattern… — UK Driving Theory Test

While carrying out a routine inspection of your vehicle, you notice that the tread pattern has worn down level with the tread wear indicator (TWI) bars in the main grooves. What does this indicate?

A
The tyre has $3.0\text{ mm}$ of tread remaining and is suitable for continued normal driving
The tyre has reached the legal minimum tread depth of $1.6\text{ mm}$ and must be replacedCevap
C
The tyre is severely over-inflated and requires air pressure to be reduced immediately
D
The front tracking is misaligned and the tyre should be moved to the rear axle

Cevap

The tyre has reached the legal minimum tread depth of

1.6\text{ mm}

and must be replaced

Tread wear indicator (TWI) bars are small raised blocks moulded into the base of the main tread grooves at a height of exactly

1.6\text{ mm}

. When the tyre tread wears down level with these bars, it shows that the tyre has reached the legal minimum limit and must be replaced before it becomes illegal and dangerous to drive on.

Adım Adım Çözüm

Identify the purpose and height of Tread Wear Indicators (TWIs)

Tread wear indicator bars are moulded into the base of the primary tread grooves at exactly

1.6\text{ mm}

in height.

Vehicle and tyre manufacturers install TWIs to provide a quick visual gauge of the statutory tread limit.

Evaluate the condition where the tread is flush with the TWI bars

The remaining tread depth has worn down to

1.6\text{ mm}

Under UK law, car tyres must have at least

1.6\text{ mm}

of tread across the central three-quarters of the breadth and around the entire outer circumference; being flush means the tyre has reached the legal minimum and must be replaced immediately.

Anahtar Kavram

Tread Wear Indicators and Legal Minimum Tread Depth

Tahmini Süre:1m 0s

Soru

Cevap

Adım Adım Çözüm

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