Method and device to monitor a car driver by using lane recognition

The method involves using driving lane detection, whereby a warning is output to the motor vehicle driver if the driving lane detection arrangement detects a critical driving situation. The activity of the motor vehicle driver is determined and the warning is suppressed or deferred for a defined period if the detected activity of the driver exceeds a defined threshold. AN Independent claim is also included for the following: (a) an arrangement for implementing the inventive method.