Forensic Engineers and Consultants

Archive: Collisions

The Middle Car Blues

Maybe you, a loved one, or even a client, have been in the unfortunate position, no pun intended, of being the creamy center in a three-car wreck. Odds are high that you have not, but those odds are also equally high that if you have, you will be shown as one of the contributors to the collision. In other words, the wreck will likely be your fault-and possibly the fault of the person behind you as well. Sure, the wreck could be the fault of the middle and third cars… that wreck would look something like this; Read More

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The Alphabet Soup of Expert Certifications

When consulting as an expert witness, having certifications can assist in establishing your credibility and qualifications.  If you’ve perused the Curriculum Vitaes of the experts at The Warren Group, Inc., you may have seen some of these letters trailing after our names.  What do they mean and what organizations grant them?  The following is a sampling of some of the certifications our experts have acquired: Read More

Springing Forward into the Dangers of Fatigued Driving

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Every spring, the United States shifts the clocks forward one hour creating an extra hour of light in the evenings. However, this shift may be linked to a slight increase in fatal traffic accidents immediately following the time change. It is theorized that the increase in fatal traffic accidents is due to two things: people losing an hour of sleep and the low illumination conditions of morning commuters. Read More

Why Pedestrians Overestimate Their Visibility: A Dive into the Psychology of Road Safety

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When we step out onto the road as pedestrians, most of us assume that we are easily visible to oncoming drivers. However, research shows that pedestrians frequently overestimate their visibility, especially at night or in low-light conditions. This overconfidence can lead to dangerous situations, contributing to accidents and fatalities. Understanding why pedestrians overestimate their visibility is crucial for improving road safety and preventing accidents. Read More

Human Factors and Halloween Hazards: Trip and Falls

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Trick-or-treating is a fun and festive activity, but it comes with certain hazards that can pose risks to children and even adults. In addition to vehicle and pedestrian collisions and accidents, tripping and falling while trick-or-treating is a common hazard, especially for children navigating unfamiliar and dimly lit areas at night.

Children and adults can face tripping hazards on walkways while trick-or-treating.

Tripping hazards can be mitigated through compliance with walkway safety standards such as ASTM F 1637-2021: Standard Practice for Safe Walking Surfaces. ASTM F1637 is a standard that provides Read More

Human Factors and Halloween Hazards: Vehicle/Pedestrian Collisions

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Trick-or-treating is a fun and festive activity, but it comes with certain hazards that can pose risks to children and even adults. In addition to trip and fall hazards while trick-or-treating, there is also an increased risk of vehicle/pedestrian collisions due to the increased pedestrian activity in the roadway at night.

Child trick or treating during Halloween in the roadway.

At night, there are two significant problems facing drivers that contribute to pedestrian/vehicle collisions: Read More

What’s Up Doc? Collision Scene Documentation & Techniques

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A proper collision scene documentation, lovingly referred to as a scene doc, will make or break the investigation… guaranteed! While not necessarily all inclusive, here are a few evidence collection / documentation techniques that have served me well over the years.

Some, if not most, collision scene evidence is short lived, and tire marks Read More

Civil Twilight Pedestrian Collision: A Case Study

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Susan, a 45-year-old runner, was jogging in the early morning approximately an hour before sunrise, also known as “civil twilight.” Civil twilight occurs both before sunrise and after sunset when the sun is below the horizon and the sky is partially illuminated. Susan was wearing dark athletic clothing and grey tennis shoes for her morning run. She was running on the sidewalk in a suburban area and began to cross the four-lane road at an unmarked crosswalk. Read More

The 9-Cell Collision Matrix – The Environment

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“Was a dark stormy night as the train rattled on…” Anybody? 1985? Scarecrow?  Come on… this was when Cougar was still a Mellencamp! Ok… it was called Grandma’s Theme… you’ll have to look that one up… but as I sat down to write this blog on the environment, that song kept running though my head. If you look it up, it will have a similar effect… just a little warning.

In our last installment of the 9-Cell Collision Matrix let’s travel down the wet, slippery slope of environmental factors that can contribute to car crashes, and maybe take a closer look at the things around us, at or near our crash scene that may reveal some important clues. Read More

What You Don’t See Can Hurt You-Undercarriage Crashes

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A 43-year-old man driving his small vehicle northbound in the right lane of a rural two-lane paved road, was on his way to his favorite hunting spot in the early morning. He had two passengers with him—one in his front passenger seat and one in his back left seat. It was dark outside, and the weather was clear and dry. Along the rural two-lane road were large wooded private properties with no ambient lighting illuminating the roadway. Further up the road, a log truck began to turn left onto the road. Unable to entirely turn left in one fluid movement, the log truck Read More

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