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A skid mark is the visible mark left by any solid which moves against another, and is an important aspect of trace evidence analysis in forensic science and forensic engineering. Skid marks caused by tires on roads occur when a vehicle wheel stops rolling and slides or spins on the surface of the road.
Witnesses are interviewed during collision reconstruction, and physical evidence such as tire marks are examined. The length of a skid mark can often allow calculation of the original speed of a vehicle for example. Vehicle speeds are frequently underestimated by a driver, so an independent estimate of speed is often essential in collisions.
An important aspect is the analysis of trace evidence such as skid marks on exposed surfaces, where contact between dissimilar materials leaves material traces of one left on the other. Provided the traces can be analysed successfully, then an accident or crime can often be reconstructed.
"Witness marks" are also an important form of trace evidence, especially in engineering and may be critical in understanding how a product failed. A typical witness mark could be an impact depression which broke a product. It is especially useful if that mark can be linked to the product which made the impact such as a hammer or nail.
Skid mark – mark a tire makes when a vehicle wheel stops rolling and slides or spins on the surface of the road. Skid marks are important for finding the maximum and minimum vehicle speed prior to the impact or incident. Trace evidence – evidence that occurs when different objects contact one another. Such materials are often transferred by ...
Forensic tire tread evidence records and analyzes impressions of vehicle tire treads for use in legal proceedings to help prove the identities of persons at a crime scene. ...
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There is a disagreement among traffic crash experts about what exactly causes a tire mark, and with all due respect to the authors of this entry, I must disagree with their assertion that heated bitumen has nothing to do with the creation of a tire mark. The simple example of children skidding with their bicycle tires is misleading, completely ...