I Can’t Get Enough of Surveillance Videos!

surveillance video

James R. Schmidt, Jr., BSME, Collision Reconstruction Engineer ::::
Surveillance and Dash Cam Video can be useful technology in evaluating vehicle speeds (among other things); but just how is this done? The following is an example that recently came across my desk for an engineering evaluation.
The client provided DJS surveillance videos from a bus. It was my job to evaluate these videos. The process included plotting incremental positions of the bus relative to roadway features and lane striping. Since the plot provided distance and the video provided time, the speed of the bus from the video was able to be determined. The bus speed versus time from incremental bus positions per the video was then graphed as illustrated below.
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