This Abstract Syntax Notation (ASN.1) file precisely specifiesthe structure of the data used to support implementation of SAEInternational Standard J2945/3. As part of an international treaty,data defined in US ITS standards are expressed in "ASN.1syntax". ASN.1 Syntax is used to define the data entities or"ASN specifications". Using the ASN.1 specification, acompiler tool can be used used to produce encodings as required bythe encoding rules identified in the standard (SAE J2945/3 messagesare encoded with UPER or JER encoding). Both this file and the SAEJ2735 ASN.1 files are necessary to collectively implement the dataexchanges described in the J2945/3. The combined library can beused by any application (along with the additional logic of thatapplication) to exchange the data over interfaces conformant toJ2945/3.

SAE J2945/3 specifies interface requirements for weather datacollection and distribution using V2X communications, includingdetailed systems engineering documentation (needs and requirementsmapped to appropriate data exchanges). The weather data can be usedfor traffic management, vehicle safety and other roadwayapplications that are represented within the National ITSArchitecture.

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