What defines a reference point at a crash scene?

A reference point at a crash scene is defined as a permanent location because it provides a fixed and reliable benchmark that can be used for measuring distances and understanding the layout of the area surrounding the crash. This permanent location can be landmarks, road intersections, or fixed geographical features, which are essential for accurately documenting the scene and for any future investigations or legal proceedings. Utilizing a permanent reference point ensures consistency and clarity when reporting and reconstructing events, making it easier for investigators to communicate findings and analysis related to the crash. A temporary location may not provide the stability needed for thorough investigation, while an area of the accident and point of impact are more specific aspects of the crash but do not serve as reference benchmarks in the broader sense needed for accurate documentation and analysis.