Vehicle Accident Reconstruction


Human factors consultants are often called upon to assist accident reconstruction experts when complex questions arise regarding the pre-impact stage of the accident reconstruction process. These include addressing driver behavior, perception-response time, attention, distraction, driver expectation, and driver error. Typical questions addressed by our human factors experts may involve:

  • Was the hazard visible?
  • When was the hazard detected?
  • Could the driver detect the slow moving or stopped vehicle?
  • Was the driver distracted by others in the vehicle or a cell phone? Was the driver fatigued, or sleepy?
  • How fast could the driver react to another vehicle or a pedestrian’s actions?
  • Did the driver respond reasonably? Did the pedestrian respond reasonably?
  • What is the effect of cell phone usage, impairment, lack of sleep, etc. on accident causation?
  • Was the event a case of pedal confusion? If so, for how long did the driver press the accelerator pedal rather than the brake?


Senior Vice President, Specialty Services

Brian C. Grieser

P.E., C.P.S.M., CSP, CPE

Principal Consultant