Final answer:
To determine if you are far enough behind the vehicle ahead of you, use the two-second rule. Leave at least a two-second gap between you and the vehicle in front of you.
Step-by-step explanation:
When determining if you are far enough behind the vehicle ahead of you, it is important to follow the two-second rule. This rule states that you should leave at least a two-second gap between you and the vehicle in front of you. To determine if you are following this rule, choose a fixed point ahead of you, such as a road sign or a tree, and when the vehicle ahead passes that point, start counting. If you reach the point before you finish counting to two, then you are too close and need to increase your following distance.