A distance information system and method are provided for a motor vehicle. At least one sensor measures the distance between the own motor vehicle and a vehicle situated ahead. A control unit is configured to determine as a function of signals of the sensor whether the measured distance is less than a specified minimum distance for longer than a specified time period. At least one optical display is activated when it is determined that the measured distance is less than the specified minimum distance for more than a specified time period. The minimum distance and/or the time period is/are defined as a function of a detected or inferred lane-change situation.