TS ISO 2575/AMD 1

TS ISO 2575/AMD 1 is an amendment to the TS ISO 2575 family dealing with symbols used on road-vehicle controls, indicators and telltales. It addresses the conventional signs used across passenger cars, light and heavy commercial vehicles, and buses, with the aim of making those operating and warning symbols easier to identify and use.

This companion document continues the focus on recognisable, user-friendly symbols and also indicates the colours of possible optical telltales that inform the driver about correct operation or malfunction of the related equipment. In general technical terms, such symbols support language-independent comprehension and help create a consistent human-machine interface on instrument panels, switches and warning lamps.

How controls, indicators and telltales differ

Controls are the elements the driver uses to select or change a function; indicators report system status; and telltales are optical signals that typically show whether a function is active, operating correctly, or experiencing an abnormal condition. Distinguishing these roles matters because the same dashboard may contain symbols serving different functions, yet all must be understood quickly and consistently.

• Applies to passenger cars, light and heavy commercial vehicles, and buses.
• Aims to support recognition and ease of use for symbols or conventional signs.
• Includes indication of colours for related optical telltales.
• This listing is an amendment document, so it complements the parent subject rather than standing alone as a full base standard.

For vehicle interior design, this kind of standardised symbolism supports consistency and reduces dependence on text labels. From a broader engineering perspective, well-designed symbols help drivers interpret functions more quickly and promote a more uniform user experience across vehicle classes.