ISO 26684:2015规定了信号交叉口合作交叉口信号信息和违规警告系统（CIWS）的操作概念、系统要求和测试方法。CIWS旨在通过提高驾驶员在信号交叉口避免碰撞的能力，降低碰撞伤害、损坏和死亡的可能性。 CIWS标准化的范围包括基本功能、功能要求、性能要求、信息内容和测试方法。 本国际标准未涉及用于信号控制器和车辆之间通信的技术特征，也未涉及驾驶员的行为反应、道路上车辆的各种能力或这两个特征的多种组合。

ISO 26684:2015 specifies the concept of operation, system requirements, and test methods for cooperative intersection signal information and violation warning systems (CIWS) at signalized intersections. CIWS are intended to reduce the likelihood of crash injury, damage, and fatality by enhancing the capability of drivers to avoid crash situations at signalized intersections. The scope of CIWS standardization includes basic functions, functional requirements, performance requirements, information contents, and test methods. The characteristics of the technologies used to communicate between the signal controller and the vehicles are not addressed by this International Standard nor are the behavioural responses by drivers, the various capabilities of vehicles on the road, or the multitude of combinations of these two characteristics.