In some cases, driving behaviour may not be affected, despite the driver being tired - e.g. when using the Pilot Assist function - with the result that the driver is then not given a warning from DAC. For this reason, it is always very important to stop and take a break in the event of the slightest sign of driver fatigue, regardless of whether DAC has given a warning.
In some cases the system may issue a warning despite driving ability not deteriorating, for example:
- in strong side winds
- on rutted road surfaces.
The function uses the car's camera unit, which has some general limitations, see the "Limitations for camera unit" section.