Which factor does NOT impact a driver's following distance?

The posted speed limits primarily provide guidance on the maximum safe speed for driving on a particular road but do not directly impact a driver's following distance. Following distance is influenced by the driver's speed, the stopping capabilities of the vehicle, and external conditions that affect how quickly a driver can react within that speed.

Following distance is significantly affected by factors such as road conditions, which can dictate how much space a driver should allow due to potential hazards like debris, potholes, or other irregularities. Traffic conditions are also crucial, as heavier traffic typically requires a longer following distance to ensure safety and adequate reaction time. Additionally, weather conditions like rain, fog, or ice can drastically reduce traction and visibility, necessitating an increased following distance to maintain safety.

In summary, while the posted speed limits establish a framework for speed, they do not directly dictate the safe following distance a driver should maintain, which is instead influenced by dynamic driving conditions and the environment.