Ontario MTO Truck Knowledge Practice Test

What happens to tires with more rain?

1. They become stickier

2. They make more noise

3. They make less contact with the road

4. They provide better traction

The correct answer is: They make less contact with the road

When considering the effects of rain on tires, it's important to understand the interaction between the tire design, the road surface, and water. In wet conditions, water can create a film between the tire and the road, which leads to reduced traction. As the water accumulates, it can cause tires to hydroplane, which means the tires lose contact with the surface of the road. In contrast, tire designs are specifically created to channel water away from the contact patch, which can help maintain grip and contact during wet conditions. While the tire's ability to maintain contact with the road may be compromised when there is significant water accumulation, a well-designed tire with adequate tread depth is likely to retain a relatively good level of contact compared to a worn-out tire. The assertion that tires make less contact with the road in heavy rain reflects the potential for hydroplaning, which can be a significant hazard. However, good tire maintenance and choosing the right tires can reduce this risk. This understanding emphasizes the critical nature of tire performance in rainy weather, aiding drivers in making informed choices about safety and vehicle handling.