The Traffic Accident Reconstruction Origin -ARnews-

Re: Scene Evidence: Skids, Yaws, Gouges, etc.

Ed Phillips (ephillpw@co.san-diego.ca.us)
Wed, 14 May 1997 10:15:23 -0400 (EDT)

The sun can have dramatic effects on what physical evidence you see on the highways. The sun can create shadows that reduce the contrast of the tire marks, or direct overhead sun can also reduce the contrast by "washing out" the roadway. At any day time scene the investigator should move in a 360 degree arc about the tire mark to find the best contrast between the evidence and the roadway for that time of day and sun position, also use a polarizing filter to reduce glare. At night scenes, if the flash light isn't too helpful, try using the different colered light thrown off by a flare and see if that helps "bring out" the physical evidence. Also at night it is important to move your light source to different angles and direction from your evidence to see what yields the best contrast.
Ed Phillips
ephillpw@co.san-diego.ca.us

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