To check their knowledge. Marcel asks his trainees which of the following, on its own. would NOT make a tyre illegal:

Explanation: The question asks which items is NOT enough to make the tyre illegal. The following answers are all incorrect because they ARE enough to make the tyre illegal:
•A cut of 25 mm or 10% of the width of the tyre.
•A bulge in the sidewall.
• The tyre is under-inflated.
This answer is the correct one:
•A cut of 20 mm or 5% of the width of the tyre: Correct because the cut would need to be in excess of 25 mm or 10% of the width of the tyre to make the tyre illegal.

Category: CPC Case Studies: Technical Matters