Supported by the National Natural Science Foundation of China (30800243, 31170908, and 81072504), and the Natural Science Foundation of Chongqing of China (CSTC.2005BA6020, CSTC.2005AB6022, and CSTC.2009AB208).
TECHNICAL NOTE ENGINEERING SCIENCES
The Experimental and Case Study of Needle Marks on the Speedometer as the Physical Evidence for the Collision Speed Analysis*
Article first published online: 8 DEC 2011
© 2011 American Academy of Forensic Sciences
Journal of Forensic Sciences
Volume 57, Issue 3, pages 772–777, May 2012
How to Cite
Tao, D., Yin, Z., Zhao, H. and Liu, S. (2012), The Experimental and Case Study of Needle Marks on the Speedometer as the Physical Evidence for the Collision Speed Analysis. Journal of Forensic Sciences, 57: 772–777. doi: 10.1111/j.1556-4029.2011.01988.x
- Issue published online: 19 APR 2012
- Article first published online: 8 DEC 2011
- Received 17 Aug. 2010; and in revised form 16 Jan. 2011; accepted 22 Jan. 2011.
- forensic science;
- traffic accident analysis;
- physical evidence;
- collision speed;
- needle marks
Abstract: The collision speed is important in accident analysis, and needle marks can be helpful as the physical evidence. The deceleration impact system has been built to analyze the mechanics of the needle and the gauge plate. Two isolated groups were designed to record the speed values under the same sample labels from real crashes. The visualization platform was built for the first group to collect needle marks. The second group recorded the speed values by other methods. The collision deceleration, the gauge plate materials, and the collision directions determine the forming of the needle marks. There were eight positive results from the 23 effective samples (12 frontal, four side, and seven rear), with discernible tip and/or middle marks on gauge plates. Multiple marks have been distinguished effectively. The low- and high-speed impacts have no obvious differences for real needle marks. It is more accurate for frontal impacts.