Which of the following is a recommended action when following a large truck?

Maintaining a 3-second following distance when following a large truck is crucial for several reasons. Large trucks have significant blind spots and may not be able to see smaller vehicles directly behind them. By keeping a safe distance, you have more time to react to sudden stops or changes in traffic patterns.

Furthermore, large trucks require a longer distance to stop than smaller vehicles due to their size and weight. The 3-second rule is a guideline that helps ensure that you can stop safely if the truck in front of you brakes unexpectedly. This distance also allows for better visibility of the road ahead, giving you a clearer sense of upcoming traffic conditions and obstacles.

Other actions like mimicking the truck's speed or following closely may place you at greater risk, as they reduce reaction time and can lead to dangerous situations. Overtaking immediately may not always be safe or practical, especially if visibility is limited or if there is oncoming traffic. Thus, maintaining a proper following distance is the best practice for safety.