Forensic Engineering Analysis of a Crash Caused by Swingout of an Articulated Booster on a Semi-Trailer
Keywords:Truck-tractor, lowboy semi-trailer, swingout, booster axle, dolly, rolling lateral friction, cross over collision , forensic engineering
An unloaded lowboy trailer with an articulated booster axle was traversing a curved exit ramp when the trailer tires lost traction, and the booster axle redirected the rear of the trailer into oncoming traffic. The reconstruction used a detailed analysis of roadway geometry, truck geometry, and suspension characteristics to determine the cause of the trailer swingout. A comprehensive topographical map was created from 3D laser scans. The interaction of each tire with the pavement surface was used to determine the individual wheel loads. Dynamic analysis of the curved path quantified the speed required to cause loss of traction and subsequent swingout.
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