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The abbreviation that describes the automatic transmission of critical vehicle and occupant data immediately following a crash is ACN, which stands for Automatic Crash Notification. ACN systems are designed to detect when a crash occurs and then automatically send important data, such as the location of the crash, the severity of the impact, and information about the vehicle's occupants, to emergency services. This rapid relay of information is crucial as it can significantly shorten emergency response times and improve the chances of a favorable outcome for the individuals involved in the crash.

The other abbreviations provide different types of information or functionalities. V2V (Vehicle to Vehicle) refers to communication technology that allows vehicles to share information with each other to enhance road safety and traffic management. GPS (Global Positioning System) stands for a satellite navigation system used for determining precise locations on Earth, but it does not specifically address crash data transmission. LOC (Location) generally denotes a geographical point but lacks the specific context of automatic crash notifications.