This Abstract Syntax Notation (ASN.1) File is the precise sourcecode used for SAE International Standard J2945/2. As part of aninternational treaty, all US ITS standards are expressed in"ASN.1 syntax". ASN.1 Syntax is used to define themessages or "ASN specifications". Using the ASN.1specification, a compiler tool produces the ASN library which willthen be used to produce encodings (The J2945/2 message set usesUPER encoding). The library is a set of many separate files thatcollectively implement the encoding and decoding of the standard.The library is then used by any application (along with theadditional logic of that application) to manage the messages. Thechosen ASN tool is used to produce a new copy of the library whenchanges are made, and it is then linked to the final applicationbeing developed. The ASN library manages many of the detailsassociated with ASN syntax, allowing for subtle manipulation tomake the best advantage of the encoding style.

This SAE Document specifies DSRC interface requirements for V2VSafety Awareness applications, including detailed SystemsEngineering documentation (needs and requirements mapped toappropriate message exchanges). These applications include:Emergency Vehicle Alert, Roadside Alert, and Safety AwarenessAlerts for Objects and Adverse Road Conditions. This documentextends the V2V Communications capabilities defined in J2945/1 tosupport these applications, and the National ITS Architecture.

The purpose of this SAE Document is to enable interoperabilityfor V2V Safety Awareness communications.

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