Perform damage analysis, speeds from damage (energy), coefficient of friction of roadway, time and distance relationships, lamp analysis, occupant kinematics, vehicle dynamics, perception and reaction times, braking efficiency of air brake systems on commercial motor vehicles, and intersection traffic signal analysis. Duties include analyzing single- and multiple-vehicle collisions, speeds, roadway drag factors, reaction times, impaired and non-impaired driving behavior, lamps, tires, time-distance relationships, and injury correlation to collisions.