What action should you take if you cannot see through the vehicle ahead of you?

When you cannot see through the vehicle ahead of you, increasing your following distance is the most prudent action. Doing so provides you with a greater visual buffer, allowing you to spot potential hazards or changes in traffic conditions that might not be visible due to the obstruction. This extra space gives you more time to react to sudden stops or movements by the vehicle in front and enhances your overall safety on the road.

Maintaining a safe following distance is particularly crucial in situations where visibility is limited, such as driving behind a larger vehicle or during adverse weather conditions. This practice is part of defensive driving and helps to ensure that you have enough time to respond appropriately to any situation that arises.

The other options may not be as effective in improving safety. While decreasing speed may seem like a reasonable action, it does not necessarily enhance your visibility or reaction time. Changing lanes immediately can be risky if there is limited visibility in adjacent lanes or if other vehicles are close by. Revving the engine does not contribute to safety or visibility and can create distractions. Therefore, increasing your following distance supports safer driving practices.