A longitudinal driver assistance system is provided in a motor vehicle. A first detection system identifies a first event which, starting from an actual speed, leads to the specification of an increased target speed at a predefined location-dependent first moment in time, and for identifying a subsequent second event which, starting from the increased target speed, leads to the specification of a target speed that is reduced in relation thereto at a predefined location-dependent second moment in time. A second detection system identifies, in an anticipatory manner, a predefined deceleration potential starting from the increased target speed to the reduced target speed. A functional unit reduces the acceleration to the increased target speed if, otherwise, the subsequent deceleration to the reduced target speed with the predefined deceleration potential cannot be completed at the location-dependent moment in time of the second event.

A cruise control interlock system detects a current set of conditions for a vehicle, compares the current conditions with cruise control interlock conditions (e.g., an adjustable threshold state of a windshield wiper system), and executes a process to deactivate the cruise control system. The process to deactivate functionality of the cruise control system may include presenting a notification to the operator to alert the operator to an upcoming automatic deactivation or to encourage the operator to deactivate cruise control. The process also may include a vehicle de-rate process (e.g., reducing vehicle speed) to induce the operator to deactivate cruise control. Deactivation of cruise control may be postponed in some situations, such as when the vehicle is ascending an uphill grade or where doing so may deactivate an active downhill speed control function.

To provide an electronic apparatus capable of easily and accurately performing an operation of changing a display. A navigation system displays standard map information in small scale on a liquid crystal display device, and displays status information on movement speed of a vehicle or guidance information on distance and direction to a cross point to turn next on a head-up display device. Only while a contact of a contact body on a surface of a touchpad continues to be detected, first scaled-up map information as the scaled-up standard map information continues to be displayed on the liquid crystal display device instead of the standard map information.