Which one of the following will NOT impact a driver's following distance?

The correct answer is that posted speed limits do not directly impact a driver's following distance in terms of it being a determining factor for how far behind a vehicle should be. Following distance is influenced more significantly by the conditions under which a driver is operating.

Road conditions, such as whether the pavement is dry, wet, icy, or under construction, can greatly affect how much space a driver needs to have to stop safely. Similarly, weather conditions, including rain, fog, or snow, can impair visibility or traction, necessitating a longer following distance to allow for safe stopping times.

Vehicle size is another critical factor since larger vehicles, like trucks, typically require more distance to stop compared to smaller cars due to their increased weight and momentum. In contrast, while posted speed limits provide guidelines for safe driving speeds, they do not inherently dictate the safe following distance, as that also depends on the roadway conditions, reaction times, and other situational factors. Thus, drivers may need to adjust their following distances regardless of speed limits to maintain safety.