Which of the following actions is NOT recommended when driving in bad weather?

Using high beam headlights in bad weather is not recommended because they can create significant glare and reflection when they hit precipitation such as rain, snow, or fog. This glare can impair visibility not only for the driver using high beams but also for oncoming traffic. In conditions of reduced visibility, such as during heavy rain or fog, it is advisable to utilize low beam headlights, which provide adequate illumination without causing glare.

The other actions listed, such as slowing down, increasing following distance, and staying focused on the road, are all essential for maintaining safety in adverse weather conditions. Slowing down allows for better control of the vehicle on slick surfaces, increasing following distance gives more time to react to sudden stops by the vehicle ahead, and staying focused ensures that a driver is aware of their surroundings and can respond effectively to any changes in road or traffic conditions.