Remember: The space between your vehicle and a large vehicle behind you on a highway should be four seconds at speeds of 46-70 mph, plus one second for every 10 feet of vehicle length. When should you use your high beam headlights quizlet? when should you switch on your high-beam headlights?.

When should you use the 4 second rule?

When weather or visibility is bad, you’ll need to increase the distance between you and the vehicle in front of you in order to follow the letter of the law. In inclement weather (light rain, fog or snow), heavy traffic or when driving at night: Double the four-second rule to eight seconds.

When should you increase your distance to four seconds?

When visibility is low such as light fog, light rain, or nighttime driving, you should double the following distance to a minimum of 4 seconds. This will seem like a large gap between you and the vehicle in front of you. That’s ok.