In some cases the system may issue a warning despite driving ability not deteriorating, for example:
- in strong side winds
- on rutted road surfaces.
In some cases, driving behaviour is not affected despite driver fatigue – e.g. when using the Pilot Assist function – resulting in the driver not getting a warning from DAC.
It is therefore important to always stop and take a break at the slightest feeling of fatigue, whether the DAC function ha given a warning or not.
The function uses the car's camera unit, which has some general limitations, see the "Limitations for camera unit" section.