现场设备是智能交通系统（ITS）的关键部件。现场设备包括交通信号、信息标志、气象站、交通传感器、用于连接ITS（C-ITS）环境的路边设备等。 ISO？20684系列定义了现场设备需要与其他外部实体（本文件中称为“管理者”，即使它们是其他现场设备）交换信息时可以使用的数据。现场设备可能相当复杂，需要对许多数据交换概念进行标准化。因此，ISO？20684系列分为几个单独的部分。本文件（第1部分）介绍了ISO 20684系列，并提供了适用于所有后续部分的规范性内容。

Field devices are a key component in intelligent transport systems (ITS). Field devices include traffic signals, message signs, weather stations, traffic sensors, roadside equipment for connected ITS (C-ITS) environments, etc. The ISO？20684 series defines data that can be used when field devices need to exchange information with other external entities (called “managers” in this document, even if they are other field devices). Field devices can be quite complex, necessitating the standardization of many data concepts for exchange. As such, the ISO？20684 series is divided into several individual parts. This document (Part？1) introduces the ISO？20684 series and provides normative content that applies to all subsequent parts.