Which action is best for reducing stopping distance?

Reducing speed is the most effective way to decrease stopping distance. When a driver decreases their speed, the kinetic energy of the vehicle is lower, which means it requires less distance to bring the vehicle to a stop. The physics behind this is straightforward: as speed increases, the distance required to stop increases exponentially due to the increased momentum. Additionally, when speed is reduced, it gives the driver more time to react to potential hazards, effectively allowing for safer stopping distances.

In contrast, increasing speed would directly increase the stopping distance, as more braking force would be needed to halt the vehicle. Rolling through intersections could also lead to emergencies or collisions, as it may not give the driver adequate attention to other vehicles or pedestrians. Using headlights, while important for visibility, does not influence stopping distance and is more about ensuring sightlines are clear rather than affecting the physical dynamics of stopping.