This document defines the message, data structures, and data elements to support exchanges betweenthe roadside equipment and vehicles to address applications to improve safety, mobility andenvironmental efficiency. In order to verify that the defined messages will satisfy these applications, asystems engineering process has been employed that traces use cases to requirements andrequirements to messages and data concepts.

This document consists of a single document that contains the base specification and a series ofannexes. The base specification lists the derived information requirements (labelled informative) andreferences to other standards for message definitions where available. Annex A contains descriptions ofthe use cases addressed by this document. Annexes B and C contain traceability matrices that relate usecases to requirements and requirements to the message definitions (i.e. data frames and data elements).The next annexes list the base message requirements and application-oriented specific requirements(requirements traceability matrix) that map to the message and data concepts to be implemented. Assuch, an implementation consists of the base plus an additional group of extensions within thisdocument.Cross References:ISO 22951ETSI/TS 102 894-2 V1.3.1SAE J2735:2016ARIB STD-T109ISO 26684IEEE 610.12:1990ETSI/TS 103 301NTCIP 1211 SAE J2945ISO/TR 17465-1ISO/IEC IEEE 24765ISO 12353-1ISO/TS 20452ISO/IEC 26514ISO/IEEE 11073-10201NMEA 0183:2008SAE J3067:2014