Correct answer
1.6 millimetres
The Traffic Regulations establish that the minimum tread depth a tyre must have is 1.6 millimetres, although it is recommended that it be above 2 millimetres. Below 1.6 millimetres, driving is not safe because the tyre will not grip the road surface properly.
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1.6 millimetres
2.5 millimetres
2 millimetres
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