本文件定义了信息、数据结构和数据元素，以支持路边设备和车辆之间的交换，以解决提高安全性、机动性和环境效率的应用。为了验证定义的消息是否满足这些应用程序，采用了一个系统工程过程，将用例跟踪到需求，并将需求跟踪到消息和数据概念。 本文件由一份包含基本规范和一系列附件的文件组成。基本规范列出了衍生信息要求（标记为信息性要求）以及对其他标准的参考（如适用）。附件A包含本文件所述用例的描述。 附录B和C包含可追溯性矩阵，该矩阵将用例与需求以及需求与消息定义（即数据框架和数据元素）联系起来。下一个附录列出了基本消息需求和面向应用程序的特定需求（需求跟踪矩阵），这些需求映射到要实现的消息和数据概念。因此，一个实现包括本文档中的基础和一组额外的扩展。 其他国际标准中提供了SPaT、MAP、SSM和SRM消息以外的信息要求的详细信息。本文档的重点是详细说明支持本文档中定义的用例的SPaT、MAP、SSM和SRM。 这些信息的采纳情况因地区而异，而且它们的采纳可能会持续很长一段时间。 本文件涵盖了路边设备和车辆之间的接口。应用程序、其内部算法以及应用程序功能在任何特定系统架构上的逻辑分布不在本文档的范围内。

This document defines the message, data structures, and data elements to support exchanges between the roadside equipment and vehicles to address applications to improve safety, mobility and environmental efficiency. In order to verify that the defined messages will satisfy these applications, a systems engineering process has been employed that traces use cases to requirements and requirements to messages and data concepts. This document consists of a single document that contains the base specification and a series of annexes. The base specification lists the derived information requirements (labelled informative) and references to other standards for message definitions where available. Annex A contains descriptions of the use cases addressed by this document. Annexes B and C contain traceability matrices that relate use cases 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. As such, an implementation consists of the base plus an additional group of extensions within this document. Details on information requirements, for other than SPaT, MAP, SSM, and SRM messages are provided in other International Standards. The focus of this document is to specify the details of the SPaT, MAP, SSM, and SRM supporting the use cases defined in this document. Adoption of these messages varies by region and their adoption can occur over a significant time period. This document covers the interface between roadside equipment and vehicles. Applications, their internal algorithms, and the logical distribution of application functionality over any specific system architecture are outside the scope of this document.