What does it signify, where the tire tread in a truck is worn to the depth of less than 1.6 mm?
Show the correct answer
Correct answer
B. That the tyres are excessively worn.
Explanation
In the photo you can see the wheels and chassis of a tractor unit. Tyre tread worn to a depth of less than 1.6 mm shows that the tyres are excessively worn - answer B.
The Regulation on the technical conditions of vehicles prohibits fitting a vehicle with tyres whose wear indicators show the tread wear limit, and, in tyres without such indicators, with tyres whose tread depth is less than 1.6 mm. Such a tyre is therefore not roadworthy and you must not continue to use it (answers A and C are wrong), and the vehicle inspector will not approve the vehicle for traffic. The reason is physical: the tread grooves drain water from under the wheel, and the shallower they are, the greater the risk of aquaplaning and the longer the braking distance on a wet surface. In a lorry the load adds to this: a worn tyre on the drive axle loses grip when pulling away uphill, and on the steered axle it makes the combination harder to control. You check the condition and pressure of the tyres during the daily check.
Legal basis: § 11 para. 7 point 4 of the Regulation on the technical conditions of vehicles and the scope of their necessary equipment; Art. 66 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym)