How many reference points should be used for each mark in triangulation?

In triangulation, the correct number of reference points to be used for each mark is two. This technique relies on the concept of creating a triangle by using known points on the scene of a traffic crash, allowing investigators to pinpoint the exact location of evidence or marks by measuring angles and distances between these points.

Using two reference points enables a clear triangulation which helps in establishing reliable data. When two known points form a base, the mark's position can be accurately calculated by measuring the angles to it from these reference points. This method enhances the precision of measurements and supports the reconstruction of the event or determination of the extent of damage.

While using one reference point could provide some information about the location, it would lack the triangulation necessary for accurate positioning. Using three or four points might provide redundancy but is not required for effective triangulation; in fact, it could complicate the process without significantly increasing accuracy. The most efficient method for triangulation specifically involves the use of two points for each mark, allowing investigators to ensure that the evidence is captured with the necessary accuracy and reliability.