Dr. Grugle is a human factors expert who specializes in investigating fatigue, sleep deprivation, and drowsy driving as well as distracted driving, looming, visibility/conspicuity, and driver behavior. Dr. Grugle has conducted hundreds of investigations on cases involving these issues as well as cases involving advanced driver assistance systems (forward collision warning, lane departure warning), roadway design (expectancy and positive guidance), and work zone safety. Dr. Grugle conducts investigations for both plaintiff and defense counsel and has testified in both state and federal courts.