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Demonstrative evidence is the means by which the expert communicates with the attorney, judge, and jury. It is the visible culmination of the accident reconstructionist's work which allows the jury to understand and remember the important evidence, concepts and opinions developed during the analysis of the collision. With an array of computational, technical, and graphic resources at our disposal, CRA excels in the development and preparation of demonstrative evidence.
Computer Animation and Scientific Visualization Animation and visualization products give the audience a very clear and compelling picture of the accident occurrence. Using engineering and computer techniques, CRA recreates the accident with 3D computer models to aid in the visualization of the actual events, according to the evidence. The collision can be viewed from any vantage point, including the driver's seat. Changes in the roadway, environment, or driver behavior can be illustrated to demonstrate the effect those changes would have had at the time of the accident. Mechanical processes, visibility obstructions, time, distance and speed variations are all commonly generated.
All motion data for the computer animation is scientifically calculated and obeys the laws of physics and nature. Detailed input information is generated to provide a paper trail of validation for each series of animation. Photography Photography is a way of recording physical evidence related to the collision. The damage to the vehicles, physical evidence at the collision scene, occupant contact points, and roadway geometry are all items commonly photographed to preserve and illustrate the physical evidence associated with the collision. The photographs form a record of the event and provide a proof of the basis for expert opinions. Various types of photogrammetical analysis (the science of making reliable measurements by the use of photographs) can be performed on photographs supplied to Collision Research Associates to establish and generate usable data on evidence that may no longer exist in the real world. CRA photographic exhibits can be created in any number or size to meet the needs of the case and client.
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Video Video has many uses. It is possible to video tape the scene drive-thru or inspection, a vehicle inspection, or any testing that is conducted. Video communicates the information in real-time to the jury. This is especially useful in situations where a key element in dispute is the ability of a driver or pedestrian to perceive, identify and react to some visual stimuli. The video provides a media to allow the jury to establish a feel for and understand the factors surrounding the collision. Using a video comprised of live images, still graphics, photographs, testing and animation provides a powerful tool for the attorney to use for settlement or trial. Graphics Graphical evidence is a very effective way to show accident scene layouts, vehicle damage, statistics or comparative evidence. Some examples of graphical evidence charts are motorcycle stopping distances v. braking input, object conspicuity v. viewing distance, and truck/tractor stopping distances v. load or brake adjustment. Click on photos for enlargement
Aerial Photography The use of maps and aerial photographs allow the observer to understand the exact location of the accident, as well as give a sense of the surrounding conditions and geometric factors involved in the collision environment.
The above aerial photograph was used as the background for the graphic overlay at left (note tickmarks and markings on highway).
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