Correct answer: B. 1.6 millimetres
All road vehicles, except motorcycles and vintage vehicles, must have a minimum tyre tread depth of 1.6 mm over the main tread. However, for safety reasons, you should replace the vehicles tyres before they become this worn.
This is an official-style question from the Managing Risk topic of the Ireland driver theory test (Cat. B). Practise all 807 questions free on iTest.ie — with timed mock exams, automatic mistake tracking and progress sync across devices.
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