In certain cases the driving behaviour may not be affected, which results in the driver not receiving any warning from the DAC. For this reason it is always important to stop and take a break in the event of any signs of driver fatigue, irrespective of whether or not DAC issues 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.