This would be best in cases where one car was speeding and if that car was not speeding, everything else being equal, there would be no collision. It is also useful for sight line problems. Elaborate fact patterns require a good amount of analysis by experts and take time to develop into an animation. All of this can add up very quickly to a sizeable fee. Good animations are expensive.
Cheap animations carry the possibility of costing even more.
Add in the cost of data acquisition by the expert and it goes up quickly. The numbers may seem astronomical, but if it makes the difference in a trial, it will more than justify the cost. Complex scenarios that would otherwise need an inordinate amount of explanation and interpretation of raw data create the best opportunities to use computer animation. An animator is not an expert, and the importance of having an expert work closely with the animator is vital to the animation's accuracy. An expert must be aware that an animation can be attacked frame by frame on cross examination.