What does a "signal 30" call indicate?

A "signal 30" call indicates an accident involving injury or fatalities. This terminology is used in many jurisdictions to communicate the severity of a traffic incident efficiently to all responding units. By specifying that the call relates to injuries or fatalities, it alerts emergency responders to prepare for medical assistance, coordinate resources, and assess the situation more critically. This level of urgency creates an immediate response plan, ensuring that the necessary medical and law enforcement personnel are deployed promptly to manage the scene effectively.

While other options reflect different types of calls commonly encountered in emergency services, they do not relate to the specific context of a serious traffic accident, which makes the indication of injury or fatalities the defining characteristic of a "signal 30."