Which of the following factors does NOT affect stopping distance?

Stopping distance is influenced by multiple factors that affect a vehicle's ability to come to a complete stop safely. Vehicle weight is crucial because heavier trucks typically require a longer distance to stop due to the greater momentum they possess. Similarly, road conditions, such as whether the surface is wet, icy, or uneven, directly impact the traction available for braking, affecting how quickly a vehicle can decelerate.

The speed at which you are traveling is also a significant factor; the faster a vehicle is moving, the longer it will take to stop. Increased speed raises both the stopping distance and the braking distance, meaning that a driver has to account for greater distances when they are traveling at higher speeds.

In contrast, while the time of day may influence visibility or fatigue levels in a driver, it does not inherently affect the physics of stopping distance. The physical factors related to the vehicle and the road conditions play a much more direct role in determining how far a vehicle will travel before it comes to a stop. Thus, time of day does not contribute to changes in stopping distances in the same way that vehicle weight, road conditions, or speed do.