What should drivers do when they notice decreased visibility due to weather?

When drivers encounter decreased visibility due to weather, such as rain, fog, or snow, the most prudent action is to slow down and increase their following distance. Reduced visibility significantly affects a driver's ability to see other vehicles, traffic signals, and road conditions. By slowing down, drivers can better react to unexpected circumstances, allowing for more time to respond to hazards.

Increasing the following distance is also critical in low-visibility situations. This additional space provides a buffer that enables drivers to stop safely without colliding with the vehicle in front of them if it suddenly slows down or stops. This practice is essential for maintaining safety on the roads during adverse weather conditions, where reaction times are naturally slowed due to reduced visibility and potentially slippery roads.

The other choices, while they may seem reasonable at a glance, do not promote safe driving in poor visibility conditions. Driving faster is counterintuitive, as it decreases reaction time and increases stopping distance. Checking blind spots is always important, but it does not address the fundamental issue of reduced visibility affecting overall driving safety. Using a phone for navigation could further distract a driver, which is particularly dangerous when visibility is already compromised. Thus, the best course of action is to slow down and increase following distance.