Tyre condition is one of the items measured during the Rwanda National Police motor vehicle technical inspection. Why is a tyre worn below the minimum tread depth dangerous?

1. The tread grooves can no longer clear water from under the tyre, so wet grip and braking collapse and aquaplaning starts at lower speeds.
2. A worn tyre grips better, because more rubber is in contact with the road in every condition.
3. Tread depth affects only tyre noise and ride comfort, not braking or steering.
4. Tread wear matters only on unpaved roads, not on tarmac.