Observations that can be made at crime scences regarding the direction of vehicle travel and vehicle postion/orientation.
Vegetation such as grass blades, corn stalks, small trees and flowers are bent into the direction of travel by a vehicle passing over and/or through the vegetation.
Soil & Snow 'droppings' are displaced into the direction of travel by a vehicle traveling at moderate speeds., as opposed to a vehicle just starting out. 'Droppings' are caused by debris adhering into the grooves and slots of the tire, then, falling out back into the track.
'Splashes' from Puddles and Stains are displaced into the direction of travel by a vehicle traveling at moderate speeds across accumulations of liquid substances such as Blood, Muddy Water, Paint, and Oil.
A vehicle traveling from an area of soil will transfer traces of soil unto a hard- covered surface such as asphault or concrete.
A vehicle at rest may leak Oil and other Liquids from the engine or Hood region. The hood region is of course at the front of the vehicle, which provides an orientation of the vehicle.
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