What is the minimum tread depth required in every major groove of tires?

The minimum tread depth required in every major groove of tires is indeed 4/32 inch. This standard is crucial for ensuring that tires maintain adequate traction on road surfaces, particularly in wet or slippery conditions. When tires have sufficient tread depth, they can effectively channel water away from the contact area, reducing the risk of hydroplaning and enhancing overall vehicle control.

Understanding that tires with less tread depth perform poorly in adverse weather conditions is essential for safety and vehicle performance. Maintaining tires at or above the minimum tread depth enhances grip and braking efficiency, which is vital for preventing skidding and ensuring the vehicle responds appropriately to driver inputs.

The other options propose greater depths, which may be beneficial for specific high-performance or off-road tires, but the legal and safety minimum stands at 4/32 inch, making it the required standard for general road use. This standard allows for a balance between performance and safety, ensuring that tires remain in good condition without requiring excessive wear beyond practical limits.