... or event information?
Guilt / innocence is determined by the court based on the available evidence.
In addition to witness statements, there are many other ways of proof, such as:
information obtained with the help of technology - video and sound recording;
indications of technical devices;
material evidence, i.e. objects of the material world containing information about the circumstances that are important for the case;
experts' conclusions - a study using special knowledge conducted by an expert, which is aimed at clarifying the circumstances that are relevant to the case;
protocol on an administrative offense in the field of ensuring road traffic safety;
scheme of the accident scene;
etc.
The above list is not exhaustive.