Why should you increase your following distance even further than usual when driving a combination vehicle in fog or heavy rain?
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Correct answer to question 61 (Combination Vehicles): Reduced visibility and traction both extend the distance needed to see a hazard and then stop for it
Why
Fog shortens how far ahead you can see a hazard while rain lengthens stopping distance, so both problems stack together and call for more following distance than either one alone would need.
Updated: November 2026