In Austrian vehicle safety and driving technique, what is the function of the wear indicator bars (TWI - Tread Wear Indicator) molded into tyre grooves?
Answer and explanation
Correct answer: A. They show when the tyre tread has worn down
- Step 1: TWI bars are small raised ridges across the bottom of the main tyre tread grooves; when level with the outer tread, the legal wear limit is reached. Answer: They show when the tyre tread has worn down. Why not the others: They indicate the correct direction of wheel rotation during mounting, They measure the balance weight required on the alloy rim and They signal the presence of internal steel belt cords do not reflect Austrian technical safety guidelines.
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