Forensic Engineers and Consultants

Al Duncan

Al Duncan

Al Duncan

ACTAR Phone: 803.732.6600 vCard LinkedIn Download CV

Expertise

  • Vehicle Collision Reconstruction
  • Crash Data Retrieval
  • Forensic Mapping Technology
  • Motorcycle Collision Reconstruction
Biography

Aaron (Al) Duncan II, ACTAR, is a vehicle collision reconstructionist with Warren. Prior to joining Warren, he worked for 23 years as a South Carolina Highway Patrol Trooper to include 10 years as a Multi-Disciplinary Accident Investigation Team (M.A.I.T.) member. Al is accredited as a Traffic Accident Reconstructionist by The Accreditation Commission for Traffic Accident Reconstruction. He investigated in excess of 1000 vehicle accidents and incidents as a trooper. Then, as a member of M.A.I.T. for 10 years, he was involved in over 1000 detailed investigations and collision reconstructions. Al has testified multiple times in state courts and has been court qualified as an expert in accident investigation and collision reconstruction.

His expertise focuses on the investigation and reconstruction of vehicle collisions involving single and multiple vehicles, animals, pedestrians, motorcycles, heavy trucks, and commercial vehicles. He is also a skilled user of forensic mapping technology and computerized collision diagramming software for collision scene analysis. Al is experienced in the data download and analysis of airbag black boxes (Crash Data Retrieval Units) in automobiles, pickup trucks, and SUVs.

Al is the President of the South Carolina Association of Reconstruction Specialists (SCARS). He is also a member of the International Association of Accident Reconstruction Specialists (IAARS) and the Blue Knights International Motorcycle Group. He holds a Bachelor of Science Degree in Political Science from Lander University in Greenwood, South Carolina and completed the Law Enforcement Basic Program at the South Carolina Criminal Justice Academy in Columbia, South Carolina.

Qualifications
B.S. in Political Science
Certified, Accreditation Commission for Traffic Accident Reconstructionist (ACTAR)
Current Member, International Association of Accident Reconstruction Specialist (IAARS)
2018-2020 President, South Carolina Association of Reconstruction Specialists (SCARS)
23-year Law Enforcement Career with Multi-Disciplinary Accident Investigation Team (MAIT) Command Experience
Experience in Vehicle Accident Investigation, Forensic Mapping, and Event Data Recorders
Publications
Event Data Recorders and Collision Reconstruction

The data captured can be imaged and is being used by vehicle manufacturers, law enforcement officers, and collision reconstructionists to better understand what is happening in a collision.  In accident investigation, EDRs have the potential to provide independent measurements of crash data that would elsewise be estimated by reconstruction methodology.

Why Scale Matters In Accident Reconstruction

When it comes to diagramming a crash scene, there are several methods to complete the task. Forensic Mapping, (locating, positioning, and documenting the evidence of a collision scene to scale) is essential to having the answers to the questions “Who, What, Where, When, and Why”. Photographs do a great job showing what the investigators saw […]

Recent Posts

Collision Reconstruction – Time Distance

A common car crash is when one vehicle makes a turn or pulls out in front of another vehicle. Normally, without the accident, the vehicles only cross paths for milliseconds. When the collision occurs it’s no doubt because both vehicles try to occupy the same space at the same moment. The question is often “who […]

Why Visit the Collision Scene?

If you are a collision investigator, a visit to the collision scene is something you want to do. No matter how much time has passed since the crash compared to the review of the case, the information that can be gleaned from walking through the area is valuable. We aren’t always given the option, but […]

Belted or Unbelted? That is the Question!

Did the driver or passenger do what they could do to protect themselves by wearing their seatbelt? There are ways to determine if the safetybelt was being used. Most modern vehicles have a computer-controlled safety system that makes decisions based on an algorithm. That algorithm uses information such as change in speed and the direction […]

Over the Hill

When traveling down the roadway, a lot of things must be considered. While things that can be seen are obvious concerns, things that cannot be seen pose a threat too. Blind hillcrests leave drivers guessing “what’s on the other side”. Regardless of their intentions, before drivers make a maneuver, they should pay extra attention to […]

The Pressure to Keep Rolling (Part 2)

One of the first safety concerns for your vehicle should be your tires. The tires on your vehicle or trailer maintain contact with the roadway and assist you in getting to your destination safely. So how do you know that your tires are proper for your vehicle, are being well-maintained, and beyond the obvious threat […]

The Pressure to Keep Rolling – Part 1

Over my years of law enforcement, crash investigation, and collision reconstruction I have come to become more and more particular about my tires. I have watched people purchase tires from these “used tire stores” and when I buy my tires I can understand why; quality tires are expensive. The question of how old is that […]

Why investigators should have “Scaled Diagrams” of scenes?

When it comes to diagramming a crash scene, there are several methods to accomplish the task. Forensic Mapping, (locating, positioning, and documenting the evidence of a collision scene to scale) is essential to having the answers to the questions “Who, What, Where, When, and Why?”. Photographs do a great job showing what the investigators saw […]

Right Turn Only

  In my 25 years of investigating collisions and traffic related incidents, one thing I have noticed repeatedly is that right turns are considerably better than lefts. I know it is obvious and sometimes seems a little petty; however, when it comes to the safety of your family, it is a big deal. Since I […]

Are 10 Minutes Worth the Risk?

Before retiring as a S.C. State Trooper, and to this day, people routinely ask me, “How fast can I go before I get a speeding ticket?” Let me start by saying one mile per hour over the speed limit can subject you to a speeding ticket. While different officers have different standards, it is easier […]

Piecing it Together…Traced Evidence

In the field of forensic investigations of traffic collisions, it can be repeated over and over that little things matter. It’s the details that align the facts to describe the event and answer the questions about the crash. Sometimes those details are simple, and they are often overlooked. The damage sustained by a vehicle involved in an […]

Aaron (Al) Duncan II, ACTAR, is a vehicle collision reconstructionist with Warren. Prior to joining Warren, he worked for 23 years as a South Carolina Highway Patrol Trooper to include 10 years as a Multi-Disciplinary Accident Investigation Team (M.A.I.T.) member. Al is accredited as a Traffic Accident Reconstructionist by The Accreditation Commission for Traffic Accident Reconstruction. He investigated in excess of 1000 vehicle accidents and incidents as a trooper. Then, as a member of M.A.I.T. for 10 years, he was involved in over 1000 detailed investigations and collision reconstructions. Al has testified multiple times in state courts and has been court qualified as an expert in accident investigation and collision reconstruction.

His expertise focuses on the investigation and reconstruction of vehicle collisions involving single and multiple vehicles, animals, pedestrians, motorcycles, heavy trucks, and commercial vehicles. He is also a skilled user of forensic mapping technology and computerized collision diagramming software for collision scene analysis. Al is experienced in the data download and analysis of airbag black boxes (Crash Data Retrieval Units) in automobiles, pickup trucks, and SUVs.

Al is the President of the South Carolina Association of Reconstruction Specialists (SCARS). He is also a member of the International Association of Accident Reconstruction Specialists (IAARS) and the Blue Knights International Motorcycle Group. He holds a Bachelor of Science Degree in Political Science from Lander University in Greenwood, South Carolina and completed the Law Enforcement Basic Program at the South Carolina Criminal Justice Academy in Columbia, South Carolina.

B.S. in Political Science
Certified, Accreditation Commission for Traffic Accident Reconstructionist (ACTAR)
Current Member, International Association of Accident Reconstruction Specialist (IAARS)
2018-2020 President, South Carolina Association of Reconstruction Specialists (SCARS)
23-year Law Enforcement Career with Multi-Disciplinary Accident Investigation Team (MAIT) Command Experience
Experience in Vehicle Accident Investigation, Forensic Mapping, and Event Data Recorders
Event Data Recorders and Collision Reconstruction

The data captured can be imaged and is being used by vehicle manufacturers, law enforcement officers, and collision reconstructionists to better understand what is happening in a collision.  In accident investigation, EDRs have the potential to provide independent measurements of crash data that would elsewise be estimated by reconstruction methodology.

Why Scale Matters In Accident Reconstruction

When it comes to diagramming a crash scene, there are several methods to complete the task. Forensic Mapping, (locating, positioning, and documenting the evidence of a collision scene to scale) is essential to having the answers to the questions “Who, What, Where, When, and Why”. Photographs do a great job showing what the investigators saw […]

Collision Reconstruction – Time Distance

A common car crash is when one vehicle makes a turn or pulls out in front of another vehicle. Normally, without the accident, the vehicles only cross paths for milliseconds. When the collision occurs it’s no doubt because both vehicles try to occupy the same space at the same moment. The question is often “who […]

Why Visit the Collision Scene?

If you are a collision investigator, a visit to the collision scene is something you want to do. No matter how much time has passed since the crash compared to the review of the case, the information that can be gleaned from walking through the area is valuable. We aren’t always given the option, but […]

Belted or Unbelted? That is the Question!

Did the driver or passenger do what they could do to protect themselves by wearing their seatbelt? There are ways to determine if the safetybelt was being used. Most modern vehicles have a computer-controlled safety system that makes decisions based on an algorithm. That algorithm uses information such as change in speed and the direction […]

Over the Hill

When traveling down the roadway, a lot of things must be considered. While things that can be seen are obvious concerns, things that cannot be seen pose a threat too. Blind hillcrests leave drivers guessing “what’s on the other side”. Regardless of their intentions, before drivers make a maneuver, they should pay extra attention to […]

The Pressure to Keep Rolling (Part 2)

One of the first safety concerns for your vehicle should be your tires. The tires on your vehicle or trailer maintain contact with the roadway and assist you in getting to your destination safely. So how do you know that your tires are proper for your vehicle, are being well-maintained, and beyond the obvious threat […]

The Pressure to Keep Rolling – Part 1

Over my years of law enforcement, crash investigation, and collision reconstruction I have come to become more and more particular about my tires. I have watched people purchase tires from these “used tire stores” and when I buy my tires I can understand why; quality tires are expensive. The question of how old is that […]

Why investigators should have “Scaled Diagrams” of scenes?

When it comes to diagramming a crash scene, there are several methods to accomplish the task. Forensic Mapping, (locating, positioning, and documenting the evidence of a collision scene to scale) is essential to having the answers to the questions “Who, What, Where, When, and Why?”. Photographs do a great job showing what the investigators saw […]

Right Turn Only

  In my 25 years of investigating collisions and traffic related incidents, one thing I have noticed repeatedly is that right turns are considerably better than lefts. I know it is obvious and sometimes seems a little petty; however, when it comes to the safety of your family, it is a big deal. Since I […]

Are 10 Minutes Worth the Risk?

Before retiring as a S.C. State Trooper, and to this day, people routinely ask me, “How fast can I go before I get a speeding ticket?” Let me start by saying one mile per hour over the speed limit can subject you to a speeding ticket. While different officers have different standards, it is easier […]

Piecing it Together…Traced Evidence

In the field of forensic investigations of traffic collisions, it can be repeated over and over that little things matter. It’s the details that align the facts to describe the event and answer the questions about the crash. Sometimes those details are simple, and they are often overlooked. The damage sustained by a vehicle involved in an […]

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