What condition must tires meet to avoid failing an inspection?

For a vehicle to pass inspection, one critical factor regarding tires is the condition they must meet. Tires should not contact the pavement in two adjacent grooves. This requirement is vital as it ensures that the tires maintain adequate tread depth and proper contact with the road surface, which is essential for safe handling and traction. If two adjacent grooves are contacting the pavement, it indicates that the tires may be worn down excessively or improperly aligned.

This avoids issues related to hydroplaning and skidding, which can lead to unsafe driving conditions. The focus on tread design is crucial since tires with sufficient tread help to channel water away and provide better grip during various driving conditions.

While the other conditions listed may have relevance in different contexts (such as minimum tread depths or restrictions on patches), the specific criterion of not having two adjacent grooves in contact with the pavement directly addresses the foundational principle of ensuring tire efficiency and vehicle safety during the inspection process.