Which condition can increase the total stopping distance of a large commercial vehicle?

The total stopping distance of a large commercial vehicle is significantly impacted by the condition of the driver. A fatigued driver may exhibit slower reaction times and diminished awareness, both of which can lead to delays in initiating braking maneuvers. This means that even if the braking system and tires are in optimal condition, a fatigued driver may not react swiftly enough to avoid a collision or safely come to a stop.

In heavy commercial vehicles, where stopping distances can already be substantial due to their weight and momentum, the impact of driver fatigue becomes even more critical. This can lead to an increase in the total stopping distance, as the driver may not perceive hazards in time or might struggle to execute proper braking techniques effectively.

In contrast, well-maintained brakes, good quality tires, and optimal traction contribute positively to a vehicle's stopping capabilities. Properly maintained brakes and high-quality tires can enhance a vehicle's ability to stop efficiently, while optimal traction ensures better grip on the road surface. These factors collectively help minimize the total stopping distance rather than increase it.