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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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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).
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).
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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
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