How does 'coverage' affect a traffic crash investigation?

The concept of 'coverage' in a traffic crash investigation primarily refers to the thoroughness with which all relevant aspects of the incident are examined. Adequate coverage ensures that investigators look at various factors, such as the physical evidence at the scene, witness statements, environmental conditions, and any other elements that could contribute to understanding the causes and circumstances of the crash. This comprehensive analysis helps build a complete picture of the event, which is essential for identifying fault, preventing future incidents, and ensuring justice in any legal proceedings that may follow.

In contrast, the other options describe aspects that do not align with the primary meaning of 'coverage' in this context. While insurance policies, the number of witnesses, and the speed of the investigation are important factors in the aftermath of a crash, they do not address the concept of ensuring a full examination of relevant aspects in the investigation process itself.