What does an intrusion of more than 18 inches at any site during a vehicle crash indicate?

An intrusion of more than 18 inches at any site during a vehicle crash is a critical indicator of the potential for severe injury to occupants. Such significant intrusion typically points to substantial force being exerted on the vehicle during the crash, which can compromise the structural integrity of the vehicle and increase the likelihood of injury.

This level of intrusion often indicates that the vehicle has been impacted in such a way that the safety zones designed to protect passengers may no longer function effectively. The body of the vehicle may have deformed, allowing less space than intended for the occupants, amplifying the risk of penetrating injuries, especially if the intrusion occurs in areas where vital organs or body parts are located. Thus, an intrusion of this magnitude is a key factor that informs first responders and medical personnel about the urgency and seriousness of the situation, warranting a trauma alert.