e similar Рliteratures are less and real car crashes are difficult to operate for verification, for some Рdifficult problems found during the research process, such as the quantity-effects Рrelationship between blocked needles and collision speeds, the reflection relation between Рgauge plate materials and specific spectra and the association between impact velocities and Рtraces morphological patterns, need to be in-depth studied. The method established in this Рstudy is only suitable for the determination of the medium- or high-speed frontal collision Рspeeds, but temporarily not for the side, the rear or the low-speed frontal collision speeds. Р Р Keywords: Needle marks; Collision speed; Frontal collision; Р Multiple spectrum analysis; Traffic accident; Forensic engineering; Traces; Р 6
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