Accidents that are perceived to be caused by human error may in fact be the result of impaired vision, caused by a number of factors including but not limited to lighting, safety reflective markings, temporary vision impairment, environmental factors, and line of sight.
Wolf experts have demonstrated in many case engagements over the years that visibility issues many times are the determining factor in accidents. Visibility issues may be overlooked because the value of their incorporation into the case investigation may not be understood.