TS ISO 2575:2010/AMD 3:2014

TS ISO 2575:2010/AMD 3:2014 is Amendment 3 to ISO 2575, the standard for symbols used on controls, indicators and telltales in road vehicles. Its subject is the set of conventional signs that help drivers identify vehicle functions quickly and the colours associated with optical telltales.

What these symbols do in a vehicle interface

In vehicle design, symbols reduce reliance on text and make switches, indicators and warning lamps easier to understand at a glance. In general technical terms, they support fast recognition of function, status and fault information, which is especially important in multilingual markets and in situations where the driver must act immediately. The difference between a control symbol and a telltale is practical: one helps identify the operated function, while the other communicates operating state or malfunction.

Vehicle categories and optical telltales

The standard applies to passenger cars, light and heavy commercial vehicles, and buses. It also indicates the colours of possible optical telltales used to inform the driver whether the related device is operating correctly or is malfunctioning. In broader human-machine interface practice, colour is a key coding tool for distinguishing normal status from warning or fault conditions.

• Symbols are intended to improve identification and ease of use on vehicle controls and indicators.
• Optical telltale colours are addressed as part of the driver information function.
• The scope covers passenger cars, light and heavy commercial vehicles, and buses.
• This listing is an amendment to the parent ISO 2575 standard, not a standalone complete replacement of it.