Tired drivers are found to be at fault in all types of traffic collisions, but the problem is especially common among commercial truck drivers. This can be attributed to the fact that truckers, as a fundamental part of their job duties, spend long hours on end behind the wheel. Spending long stretches of time behind the wheel, especially on the open highway, can lead the development of a condition known as highway hypnosis, in which the driver settles into a state of monotony and becomes essentially a robot. As the day drags on, a truck driver will gradually become more and more tired, until the time when common sense would dictate that it is time to get off the road.
Many truckers, however, push the limits of safety by staying on the road despite the fact that they have become fatigued and are less likely to react to an emergency in the time necessary to avert a disaster. Often, this is a result of the fact that the driver is under enormous pressure from his or her employer to meet stiff delivery deadlines on time. In other cases, it is because the driver is getting paid by the mile and wants to maximize his or her paycheck. Sometimes, there is no good reason and it is simply because the driver has an inflated concept of his own ability to drive through fatigue.