The invention relates to a driver assistance system provided with an auxiliary system. The driver assistance system comprises detecting means for detecting information about a vehicle and influencing means for influencing a direction of movement and/or the speed of the vehicle according to information about said environment. The auxiliary system is used for issuing assistance information to the driver of the vehicle. The auxiliary system comprises recognition means for recognizing whether the driver assistance system can be operated in a reliable manner in a momentary environment state and/or in a future environment state and/or an operational state of the vehicle. The auxiliary system is connected to the recognition means and is embodied in such a manner that information can be given to the driver during operation of the vehicle if the driver assistance system cannot be operated in a reliable manner.