What is the first thing to understand about stopping on snow or ice?

The correct answer emphasizes the importance of understanding that the brakes primarily stop the wheels of the vehicle. When driving on snow or ice, it is crucial to remember that while the brakes are responsible for applying force to the wheels, the actual stopping power relies heavily on the interaction between the tires and the road surface. On slippery surfaces, such as snow or ice, the ability of the tires to grip the road is significantly reduced. This means that even if the brakes are applied effectively, if the tires cannot maintain traction, they will not be able to stop the vehicle efficiently. Therefore, focusing on the relationship between the brakes and the wheels helps in grasping the dynamics of stopping on treacherous surfaces, ensuring that drivers are more aware of how to manage their stopping distance and maintain control in challenging conditions. Understanding this can lead to safer driving practices, especially in winter weather.