Advanced Automatic Collision Notification (AACN) is also known as Advanced Automatic Crash Notification and is the successor to Automatic Collision Notification (ACN). This system is found on a number of motor vehicles and is used to alert emergency services that a crash has occurred and to automatically summon assistance.
When a crash has occurred (as determined by various sensors, airbag deployment, or seatbelt pretensioners), the AACN will initiate an emergency wireless call to a Telematics Service Provider (like Onstar) to deliver the vehicle's GPS location, crash-related data and open a voice communications channel to the emergency call center.
The Advanced ACN improves the data sent from the ACN version, as it include crash-severity data (including: speed, delta velocity, number of occupants and rollover data) as collected by in-vehicle sensors. This additional data could be used by emergency services providers to determine the quantity and type of rescue equipment that should be dispatched.
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The Vehicular Emergency Data Set [1] is an XML-based standard for reporting collision data elements and medical data elements related to a collision. The standard was developed by the ComCARE Alliance, and is aimed at relaying critical information to facilitate efficient emergency response. This data set can be transmitted automatically to a response center, which can then forward it to emergency services providers. In the U.S., the Next Generation 9-1-1 initiative will enable a Public Safety Answering Point to automatically receive and process this data, thereby allowing for a quicker and more efficient response to a vehicle emergency, even when all occupants of the reporting vehicle are incapacitated.