3D simulation offers you the most accurate way to know what really happened before, during, and after a collision.
Traditionally, reconstruction analysis has been performed manually with relatively little sophistication. Rather than a few pages of simple calculations, simulations perform thousands of calculations and account for phenomenon that can not be studied any other way. We can say that the results show what really happened based upon the laws of physics.
Because the analysis is three-dimensional, the results can be viewed from any angle or perspective as a real-time movie. The inherent complexities of a reconstruction suddenly become easy for a jury to see and understand.