CDL Tanker Endorsement Practice Exam

What should you do when driving on a clear night with high beams?

1. Turn off your headlights

2. Maintain high speed

3. Dim your headlights from high to low

4. Use only low beams

The correct answer is: Dim your headlights from high to low

When driving on a clear night with high beams, it is important to dim your headlights from high to low when you encounter oncoming traffic or when you are following another vehicle. This action is crucial for road safety as high beams can cause glare for other drivers, which can lead to accidents. Using high beams is effective in increasing visibility on dark roads, but once you notice another vehicle, switching to low beams helps prevent temporary blindness for those drivers. This allows for safer navigation for everyone on the road while ensuring that your own visibility is still appropriately adjusted based on the traffic situation. Maintaining the high beams while encountering other vehicles can compromise safety, making it essential to follow the practice of dimming your headlights to avoid impacting others' ability to see.