The information they contain is not only used to present evidence but is used in many collision situations by an expert to determine time, speed, distance and collision avoidance tactics. Scale Models One step up from diagrams is the scale model. The difference between diagrams and a model is the model has three dimensions. Cars, trees, poles, signs, buildings and people can all be included. If the vehicles are not fixed on the model board, they can be moved and placed by witnesses to demonstrate what happened.
Scale models can be as simple or intricate as desired.
They are particularly useful for situations involving vehicles that move in several directions, such as backing up then moving forward, before an accident occurs. Scale models are more expensive than diagrams but have the advantage of depth. The production of a scale model can be moderate to expensive. The cost is dependent entirely upon the size of the scene to be presented and the number of items that will be shown. Costs can increase if the model is to have any moving parts or lighting installed.