In New Zealand, the minimum tread depth required for car tires is 1.5 millimeters. This regulation is very important because sufficient tire tread depth is essential for maintaining good traction on wet or slippery roads. If the tread depth is inadequate, it becomes difficult for the car to remain stable during driving, especially during emergency braking or turning, which increases the risk of traffic accidents. Ensuring that the tire tread depth meets legal standards helps improve road safety and reduces traffic accidents caused by poor tire conditions. Therefore, checking and maintaining tire tread depth is the responsibility of every vehicle owner and is a crucial step in ensuring the safety of oneself and others.