The plane which is defined by the head-to-foot and anterior-to-posterior directions in the human body. A stack of images acquired in the sagittal plane separates images by their left-to-right locations. The mid-line sagittal plane bisects the left and right half of the human body.
Under heavy braking, the rear tires lock up and the axle begins to bounce; the amplitude of the bounce becomes so severe that the tires finally develop enough traction (when slamming hard against the pavement) to rip the whole axle assembly free of the vehicle.
Factors such as the use of prescription and over-the-counter drugs, speeding, fatigue, inattention, distractions, work environment, and unfamiliarity with the road all can contribute to driver error. But by far the most common causes of trucking accidents are driver fatigue and sleep deprivation. (To learn more about trucking accidents caused by driver error, read Nolo's article Trucking Accidents Caused by Driver Error.).