Automatic crash notification (ACN) systems can provide all of the following information about a car crash, EXCEPT:

Automatic crash notification (ACN) systems are designed to provide critical information to emergency responders immediately after a collision. They typically include features that allow them to send data such as the geographic location of the crash, which helps first responders reach the scene quickly. Additionally, ACN systems can often determine the principal direction of force at the impact point, which aids in understanding the severity and type of crash, and they may also have the capability to report whether seatbelts were in use at the time of the crash, as this information is crucial for medical and legal assessments.

However, ACN systems do not have the capability to provide the speed of the other vehicle at the time of the crash. Determining the speed of an involved vehicle typically requires more advanced forensic analysis post-incident, including physical evidence from the crash scene and vehicle telemetry, if available. This limitation is due to the fact that ACN systems primarily focus on providing immediate, readily available data that can assist in the initial response rather than detailed crash analysis.