Under what conditions is it appropriate to use the two-second rule for following distance?

The two-second rule for following distance is a guideline used to maintain a safe space between your vehicle and the one in front of you, ensuring adequate stopping time in case of sudden stops. This rule is particularly applicable in ideal weather conditions on lower speed roads because the risks associated with stopping distances, skidding, and visibility are less pronounced.

When road conditions are clear, the two-second gap provides sufficient time to react without the need for additional braking distance caused by adverse weather. On lower speed roads, the shorter stopping distances that accompany lower speeds further affirm the appropriateness of using the two-second rule, as it allows for safe navigation without the heightened risks experienced in more challenging conditions such as heavy rain or fog, which require increased following distances for safety.

In summary, the two-second rule is most effectively applied when the driving conditions are favorable, making option B the correct choice, as it promotes safe driving practices in environments where hazards are minimized.