In which situation is it important to add a second or more to your following distance?

Increasing your following distance by a second or more is crucial when there is a heavy vehicle in front of you. Heavy vehicles, such as trucks or buses, have longer stopping distances due to their size and weight. If this type of vehicle needs to stop suddenly, there may not be sufficient time or space for smaller vehicles to react safely without increasing their following distance.

By allowing additional distance, you give yourself more time to perceive unexpected stops or changes in speed from the heavy vehicle ahead. This added buffer also helps to mitigate risks associated with limited visibility, as larger vehicles can obstruct your line of sight and reduce your ability to react quickly. In contrast, situations like low traffic or clear days may not require as much additional distance, as conditions are typically more predictable and manageable.