In what scenario should following distances be decreased?

Following distances should be decreased during situations that allow for better control and visibility rather than when conditions are ideal or unimpeded. In perfect weather, clear visibility, or driving on a smooth road, there is usually an expectation of maintaining a larger following distance. This provides the driver with ample time to react to any sudden changes or emergencies.

Maintaining increased following distances is particularly important in adverse conditions, such as rain, fog, or heavy traffic, where reaction times may be slower or stopping distances may be longer. Hence, when the environment is less predictable or more hazardous, it's crucial to keep an adequate space between vehicles to avoid collisions. The recognition of when to decrease following distanced should primarily focus on ensuring safety and preparedness rather than on optimal driving conditions.