1 ptsC,C1Official number: 6818
What does it signify, where the tire tread in a truck is worn to the depth of less than 1.6 mm?

Explanation
Correct answer: That the tyres are excessively worn.
According to the regulations, the minimum permissible tread depth for a lorry tyre is 1.6 mm. A value lower than this indicator means that the tyre is worn to an extent that prevents its continued safe operation. Therefore, a tread depth of less than 1.6 mm is evidence of excessive wear, which qualifies the tyre for immediate replacement.