ISO/TR 12204:2012 provides general, informative guidance for the integration of safety critical and time critical warning signals (signals which, if ignored even briefly, could result in bodily harm to the occupant(s) of the vehicle and/or to other road users) into existing in-vehicle messages presented to a driver. Integration of non-critical signals are outside the scope of ISO/TR 12204:2012, except to confirm that they do not affect the driver's comprehension of safety and time critical signals.
ISO/TR 12204:2012 provides:
1) possible approaches for determining if integration is necessary to mitigate the possibility that signals from one or more vehicle system may degrade the driver's comprehension of, or response to, safety critical warning signals from another system(s); and
2) a discussion of possible methods for assessing potential integration conflicts.