Surveying and assessing site locations
Although the police will often produce photographs and scale plans of the site of an accident, it is usually essential for the investigator to examine, survey and photograph the site of an accident before a proper report can be prepared.
It is all too easy to gain a false impression of a site without actually seeing it.
Plans and photographs prepared by other persons may not be sufficiently detailed or may not show some feature that the investigator believes may be important to his analysis. Additionally, that feature may not become apparent until the site is personally inspected.