What defines a 'secondary crash' in traffic investigations?

A 'secondary crash' in traffic investigations refers to incidents that occur as a direct result of the initial crash, often involving additional vehicles. For example, when a driver tries to avoid a collision or is distracted by the primary crash, they may cause another accident. This type of crash is significant in investigations because it provides insight into the dynamics and consequences of the initial collision, allowing for a complete understanding of the incident's impact on traffic flow and safety.

In traffic safety and investigation studies, understanding secondary crashes is crucial as they reveal how events unfold after an initial collision, which can affect response times, road blockage, and overall safety for both responders and other motorists on scene. Recognizing this aspect is vital for improving future traffic management and safety protocols.