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|Speed Equation Accident
Accident reconstruction experts can employ a variety of methods in analyzing and explaining a traffic accident. The specific method is generally determined by the type of
accident and evidence available to the reconstructionist. The following methods are just a few of the scientifically validated techniques that our experts use in reconstructing
The reconstruction of a traffic accident via momentum
analysis is aimed at deriving the impact speeds of two
vehicles based on known variables such as departure
speeds, angles of approach and/or angles of departure.
Thorough scene and vehicle inspections helps ensure that
the required roadway evidence is available for such an
The reconstruction of a traffic accident via energy analysis is aimed at deriving
the impact speeds of one or more vehicles based on the measured amount of
crush (damage) on a vehicle.
Generally, when dealing with pedestrian accident reconstruction, the expert must first
determine if the collision was a frontal projection (high front end vehicle) or frontal wrap
(low front end vehicle). In order to calculate a vehicle's impact speed, the reconstructionist
must know, at a minimum, the distance that a pedestrian was projected (thrown) after
Under special circumstances, vehicle speed can be
determined by examining roadway marks. A critical speed
yaw analysis requires the precise measurement of cords
and middle ordinates for the purpose of deriving the radius of
a curve. That radius can then be used to calculate the speed
of a vehicle through the curve.
Calculating the amount of speed that a vehicle lost due to
rotation is just one of the many techniques employed by our
experts when reconstructing a traffic accident.
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Often, when vehicles leave the roadway, they fall, flip or vault. And, in many cases, accident
reconstruction experts can utilize a mathematical equation to calculate the takeoff speed of
the vehicle if they know the horizontal distance the vehicle traveled, the vertical difference in
elevation that the center of mass rose or fell, and the angle of takeoff. In the illustration
above the vehicle struck a low lying obstruction and vaulted.
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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,
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