In what scenario must a driver increase their following distance?

Increasing following distance is crucial in conditions where visibility and traction are compromised, and driving in fog or heavy rain creates such a scenario. In these weather conditions, the likelihood of hydroplaning or encountering reduced visibility is significantly higher, which can affect a driver's ability to react to sudden stops or changes in traffic. A longer following distance allows for more time to assess situations further down the road and respond safely to any hazards that may arise.

While driving on a straight highway, in a residential area, or even below the speed limit, the conditions may not require an increase in following distance as critically as when facing adverse weather. In those scenarios, standard following distances are generally sufficient for maintaining safe driving practices.