Accident Reconstruction Experts
Copyright © 2007-2014         Crash Data Services, LLC         All rights reserved
Video Gallery
Home
Accident Reconstruction
Crash Data Retrieval
About Our Experts
In September 2008, the Illinois Association of
Technical Accident Investigators (IATAI) also
sponsored a series of crash tests aimed at
validating various crash reconstruction methods
such as
crush energy.  Crush energy is aimed at
deriving the impact speeds of one or more
vehicles based on a measured amount of crush
(damage) on a vehicle.

The GMC truck pictured above was dropped from
a crane, causing significant crush.  
During the September 2008 testing, a wide variety
of vehicles were sampled, including the previously
mentioned Corvette and a Ford E350 van.  
Regardless of vehicle or tire type, skidding tires
performed approximately the same.

ABS braking, however, was dramatically different.  
ABS performance was heavily reliant upon what
system the vehicle was equipped with.

The video above depicts one of the skid tests
performed as part of the validation testing.  This
test involved a 2008 Ford E350.
Many vehicles are equipped with rollover sensors
(ROS), capable of recording vertical, lateral and
roll rate crash pulses should the vehicle be
involved in a rollover collision.

ROS sensors are one type of airbag control
module that records data within its
event data
recorder
(EDR).  Crash Data Services, LLC
employs certified analysts capable of interpreting
vehicle crash data.  Our experts can use EDR data
to validate traditional accident reconstruction
methods.

The GMC truck pictured above was dropped from
a crane to simulate a serious side impact.
In September of 2008, reconstructionists from the
Illinois Association of Technical Accident
Investigators (IATAI) teamed with adjunct
instructors from the Institute of Police Technology
and Management (IPTM) to test the performance
of various types of tires and
anti-lock braking
systems
(ABS).

ABS braking, under most circumstances, is
significantly better than sliding or skidding to a
stop.  

The video above depicts one of the skid tests
performed as part of the validation testing.  This
test involved a 2005 Chevrolet Corvette.
In order to correctly apply accident reconstruction
techniques, investigators must first test theories
under controlled circumstances.  

This process is called
validation testing.  
Validation testing is useful because it
demonstrates that accident reconstruction
techniques work not only in theory but, when
tested empirically, can also be applied to real
world traffic accident investigation.  
The critical speed of a yaw (CSY) equation is often
employed by accident reconstructionists when
attempting to determine the speed of a vehicle.  
Yaw marks are a type of tire mark that are often left
at the scene of a high speed accident, wherein a
vehicle lost control and ultimately left the roadway.

In the video above, the 2008 Ford Crown Victoria
was purposely sent into a yaw at about 42 MPH.  
When proper measuring protocol of the
subsequent yaw marks was followed, the
mathematically derived speed was nearly identical
to the measured speed via VC4000 accelerometer
GPS.
In addition to the application of theoretical accident
reconstruction, many experts have spent a
significant amount of time validating
event data
recorders
(EDRs). EDRs are part of a vehicle's
airbag control module (ACM), powertrain control
module (PCM) or rollover sensor (ROS).  

In the video above, the 2008 Ford Crown Victoria
was braked to a stop at a number of speeds and a
download of the EDR data contained within the
vehicle's PCM was performed.  The EDR reported
speed of the vehicle was nearly identical to the
measured speed via the VC4000 accelerometer
and GPS.
Traffic accident reconstruction begins with
understanding the dynamic interaction between
vehicles when they collide.  Generally, accidents
happen very quickly.  In the staged collision
above, the crash pulse lasted less than 1/10 th of
a second.  High-speed video allows expert
accident reconstructionists to illustrate the
relatively short, yet potentially destructive, period
when vehicles interact.

In September of 2009, the Illinois Association of
Technical Accident Investigators (IATAI)
sponsored a crash test aimed at validating
impact speed calculations.  Experts used
high-speed video to capture and document the
collision.
Fraud Investigation
Rollover accidents are extremely dangerous,
accounting for hundreds of deaths every year.

These types of accidents generally occur off-road
and at high rates of speed.

In September of 2010, the accident
reconstructionists from the Illinois Association of
Technical Accident Investigators (IATAI)
sponsored rollover testing to examine and analyze
these hazardous crashes.
In order to perform a meaningful analysis of any
collision, an expert must understand the dynamics
of the accident that is being investigated.  Rollover
collisions are especially challenging because they
often involve multiple ground impacts over lengthy
distances.

In the above video, reconstructionists intentionally
sent an SUV into a rollover in order to study the
dynamics of the crash.

This test was sponsored by the Illinois
Association of Technical Accident Investigators
(IATAI).
The content and photos on this website are the property of Crash Data Services, LLC and may not be used, reproduced or copied for any reason.
By using this website, you agree to our terms & conditions and privacy policy
Home  |  Accident Reconstruction  |  Crash Data Retrieval  |  Photos  |  Videos  |  Our Experts  |  Contact Us  |  FAQ  |  Case Law  |  Policies  |  Site Map  |  Links  |  Search
Crash Data Retrieval Training
Disclaimer: Crash Data Services, LLC and crashdataservices.net provide the information in this web site for informational purposes only. The information is not intended to be legal advice or an expert
opinion and should not be construed as such.  The use of this site does not create a contractor/client relationship with any employee of Crash Data Services, LLC.   Each investigation is different. Case
results depend on a variety of factors unique to each case.  The results of any investigation/reconstruction do not guarantee or predict a similar result in any future case undertaken by Crash Data Services,
LLC
Our experts are always available to fulfill your accident reconstruction needs  Call today for a free consultation:  (847)-217-6644 or reach our reconstruction experts by email
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
Animation
Move beyond the chalkboard with our experts and
experience computerized 3D simulated traffic
accident reconstruction.

3D animation is a field of traffic accident
reconstruction where our experts recreate
collisions by means of computer simulation.  
These computer simulated accidents have
become increasingly popular in recent years
because they clearly explain the opinion that is
being expressed.