Under which conditions should you increase your following distance to 4–6 seconds?

• A. During normal, clear-day driving on a highway.
• B. In rain, snow, or low visibility and when following large vehicles.
• C. Only during night driving on rural roads.
• D. Only in heavy city traffic with frequent stops.

Answer: (B)

When conditions make it harder to stop or see hazards, you need extra space ahead of you. Increasing your following distance to about four to six seconds gives you a longer cushion to react and brake safely. This is especially important in rain, snow, or low visibility, where braking distances are longer and it’s harder to spot hazards early. It’s also crucial when you’re behind large vehicles, which can block your view and require more distance to stop because of their longer stopping distances and bigger blind spots.

In clear highway driving, a three-second rule is usually enough, so pushing to four to six seconds isn’t typically necessary unless conditions worsen. Night driving on rural roads or heavy city traffic with frequent stops may require extra space, but the scenario described—wet or snowy conditions with limited visibility and behind large vehicles—is the clear case for increasing to four to six seconds.