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The Collision Reconstruction Matrix – The Human
December 21, 2022 3:07 pm Leave a Comment
Murder, suicide, deceit, and intrigue… car crashes? You bet! In our next installment of the 9-Cell Collision Matrix let us dive a little deeper into the glue that binds all this together, the human element.

Photo by Mark Turner

Let’s begin with the most basic human element at the root cause of car wrecks, our old friend inattention. Inattention… a vast word that encompasses many lackadaisical conditions. The daydreaming 16-year-old in math class, the radio knob turner, the back seat talker, the quarter pounder with cheese eater, and perhaps the most offensive, the cell phone user. All very dangerous behind the wheel, and one very dangerous to your future… as it turns out, you will always need good math skills… ask me how I know? Driving is of course a divided attention endeavor, (more…)
Danger Within Reach
October 13, 2022 9:37 am Leave a Comment
How far away from a hazard should you stay? Your parents or grandparents would probably have told you to stay far away, but what are you to do when a hazard is present, and you must work around or near the hazard? And what exactly is a hazard? ISO 12100 Safety of machinery – General principles for design – Risk assessment and risk reduction defines a hazard as a “potential source of harm.”

Where would a designer of a machine or product start if they wished to protect the user from a known hazard? Consensus standards are a great place to begin the quest for safety. (more…)
The Vehicle (EDR)
October 7, 2022 2:54 pm Leave a Comment
In a previous blog post, we began to delve a little deeper into the vehicle aspect of the 9-Cell Collision Matrix by taking a look at tires. Let’s now take a closer look at the very diverse and interesting topic of Event Data Recorder (EDR) data. (more…)
Scared of Water, or Prefer to Get Drenched? Fire Suppression with Preaction and Deluge Systems
August 29, 2022 2:11 pm Leave a Comment
In my two previous blogs, we first discussed wet sprinkler systems (Wet), the most basic and most common fire system type followed by dry sprinkler systems (Dry), which are a bit more complicated. Ratcheting up another level, in this last edition on sprinkler systems, let’s take a look together at preaction and deluge systems. These can be complex and variable, so we’ll operate at the 30,000 ft level. (more…)
The Vehicle – Tires
July 26, 2022 7:53 am Leave a Comment
In a previous blog post, I gave an overall introduction to the 9-Cell Collision Matrix as an investigative tool used in collision reconstruction. Now let’s focus in a little at each element.

They are called car wrecks, after all…so let’s start with a more comprehensive look at the vehicle component of the matrix. This review of the vehicle before, during, and after the collision will highlight a few important factors but is not meant to be all-inclusive. So, let’s get started! (more…)
Everybody Has A Part to Play – What’s Your Role?
July 15, 2022 1:55 pm Leave a Comment
Across industry and construction sites, there are times when employees of different employers are working side by side, or at least on the same site at the same time. Some industry examples are when chemical plants have contractors on-site for routine maintenance or during process shutdowns for major overhauls or repairs. OSHA refers to these as multi-employer worksites. In December of 1999, they revised their citation policy which allows for more than one employer at a worksite to be cited for conditions that violate OSHA standards. (more…)
When a DRY Fire Sprinkler System Leaves You Soaked
July 1, 2022 2:13 pm Leave a Comment
In my previous blog , I discussed the most basic and most common fire system type: wet sprinkler systems. The possible failure areas discussed with wet systems will also apply to dry sprinkler systems (control valves closed, obstructions, issues in the system, installation, or deficiencies with inspection, testing, and maintenance). Dry systems are even more prone to obstructions than wet systems, so close attention should be paid to that possibility. (more…)
HEY…Cover Up Please!
June 20, 2022 12:36 pm Leave a Comment
Machine guards can be compared to the clothes we wear every day. Indeed, they serve a very important purpose. Imagine someone leaving their home on a fine, sunny morning wearing nothing but a smile. Wonder how far they will get through the day before things start going poorly for this individual?

There will be more than a few raised eyebrows and blushes when he stops into the local Starbucks for his usual morning double-dipped and whipped, chocolaty chip with a touch of pumpkin spice cappuccino fix. Good luck with that! Probably going to leave disappointed, empty-handed, and likely wearing handcuffs. This will be the beginning of a very long, very bad day for that individual. Had he recognized the risks associated with this type of behavior, and then put forth a little effort to cover up, he would have prevented many unfavorable and possibly life-changing personal and legal problems from ever occurring!

And so it is with properly guarding a machine. Machine safeguarding helps to protect workers from preventable injuries. (more…)
One Small Step…
June 8, 2022 4:14 pm Leave a Comment
Ladders…not a particularly exciting topic I’ll admit. But hey, we need ladders to help us accomplish all kinds of tasks. Most people have used at least one of the many types of ladders that are available today. And the odds are probably pretty good that many of those users strayed outside the limits of safety a time or two while on a ladder. It is amazing the risks some people will take to save some time or avoid the inconvenience of getting down to move the ladder into a safer position. I wonder how many of those risks would be taken on a ladder if the users knew they were on camera.

Think about astronaut Neil Armstrong. He travelled by rocket almost 239,000 miles through space and (more…)
Financial Injury.…From a Machine?!?!
May 24, 2022 4:11 pm Leave a Comment
Forensic engineers may be called upon to investigate a broad array of problems concerning a machine. Cases involving physical injuries and even death are a large part of what we investigate in order to determine what caused the accident to happen and who may be at fault. Occasionally, problems with a recently designed custom machine do not cause a physical injury, but instead cause a “financial” injury. This type of “injury” can negatively impact the machine designer, the machine purchaser, or possibly both. Financial injuries can be quite substantial, just as physical injuries can be, and may severely impact a company’s cash flow which can make or break a company. A refusal to pay a designer/builder of a machine or paying for a machine that ends up not meeting the agreed upon performance specifications can have catastrophic consequences for many businesses, especially for small ones. (more…)

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