Trend of speed analysis in accident reconstruction

Motorization produced tra‹c accidents and its con‰icts to be brought into the court of law. The ˆeld of accident reconstruction was born to cope with these litigations. Essentially, tra‹c accident is a crime of negligence. Punishment and insurance payment depend upon the assessment of the case. Vehicle speed plays an important role in the ratio of fault and plays an important role as a standard of fault authorization. An analysis method has been developed ever since. Now in Japan, tra‹c accident is punished with a special law independent from the existing penal code. Speed analysis has become a more important factor under this law. Therefore speed analysis has a long historical path and still plays an important ˆeld within forensic science. Fundamental method of speed analysis has been long based on the application of basic physics principles. Recent evolution of electrical devices brought another approach to the speed analysis. Images of CCTV, drive recorders, and vehicle mounted electrical data are oŠering a good chance to analyze vehicle speed. We would like to review the speed analysis of the traditional methods and overview the trend of recent methods of the new era.