Final answer:
When driving on glare ice, it's safest to stop driving as soon as possible. Additional friction is beneficial in situations like winter tires designed for icy roads. Salt is used to melt ice on roads by altering the freezing point, and understanding friction is critical for smooth driving experiences. The correct answer is A.
Step-by-step explanation:
When you encounter glare ice on the road, the best course of action is to stop driving as soon as you safely can. This is because when roads are covered in glare ice, the friction between the tires and the road surface is significantly reduced, making it difficult to maintain control of the vehicle. In terms of increasing friction, one example where more friction is desirable is when using tires designed for icy or snowy conditions; these tires have deeper treads and a softer rubber compound to grip the road better. Salt is spread on icy roads by trucks to lower the freezing point of water, which helps to melt the ice and snow, improving traction. This process is an example of lowering the freezing point of a solution, similar to how adding a solute can also affect the boiling point. The correct answer is A.