ISO 7731:2003规定了信号接收区公共区域和工作区域危险信号的设计物理原理、人类工效学要求和相应的测试方法，并给出了信号设计指南。它也可能适用于其他适当的情况。 ISO 7731:2003不适用于口头危险警告（例如喊叫、扬声器公告）。ISO 9921涵盖了口头危险信号。 公共灾难和公共交通等特殊法规不受本国际标准的影响。

ISO 7731:2003 specifies the physical principles of design, ergonomic requirements and the corresponding test methods for danger signals for public and work areas in the signal reception area and gives guidelines for the design of the signals. It may also be applied to other appropriate situations. ISO 7731:2003 does not apply to verbal danger warnings (e.g. shouts, loudspeaker announcements). ISO 9921 covers verbal danger signals. Special regulations such as those for a public disaster and public transport are not affected by this International Standard.