Method for determining a group of at least two adjacently arranged illumination units (125a, 125b) during the travel of a vehicle, wherein the illumination units (125a, 125b) represent structural objects in the region or at the edge of a roadway which actively emit light, wherein the method comprises the following steps: - recognizing at least one first illumination unit in a detection region of a sensor and recognizing subsequent exiting of the first illumination unit from the detection region of the sensor; - beginning of measuring a distance travelled by the vehicle after exiting of the first illumination unit from the detection region of the sensor and/or beginning of measuring a time during which the vehicle travels after exiting of the first illumination unit from the detection region of the sensor; and - grouping the first illumination unit with a second illumination unit into the group of at least two adjacently arranged illumination units, characterized in that in the step of grouping, the first and second illumination units are grouped into the group of at least two adjacently arranged illumination units if a measured distance until exiting of the second illumination unit from the detection region of the sensor is shorter than the distance threshold value and/or in that in the step of grouping, the first and second illumination units are grouped into the group of at least two adjacently arranged illumination units if a measured time until exiting of the second illumination unit from the detection region of the sensor is shorter than the time threshold value, wherein furthermore in the step of grouping, the first and second illumination units are not grouped into the group of at least two adjacently arranged illumination units if the distance is longer than the distance threshold value and/or wherein in the step of grouping, the first and second illumination units are not grouped into the group of at least two adjacently arranged illumination units if the time is greater than the time threshold value, and/or in the step of recognizing, at least one third illumination unit is recognized, wherein in the step of grouping, the third illumination unit is grouped into the group of at least two adjacently arranged illumination units if a further distance travelled by the vehicle proceeding from exiting of the first illumination unit from the detection region of the sensor until exiting of the third illumination unit from the detection region of the sensor is shorter than the distance threshold value and/or wherein in the step of grouping, the third illumination unit is grouped into the group of at least two adjacently arranged illumination units if a time during which the vehicle travels proceeding from exiting of the first illumination unit from the detection region of the sensor until exiting of the third illumination unit from the detection region of the sensor is shorter than the time threshold value, and/or in the step of recognizing, a third illumination unit is recognized, wherein in the step of grouping, the third illumination unit is not grouped into the group of at least two adjacently arranged illumination units if a further distance travelled by the vehicle proceeding from exiting of the first illumination unit from the detection region of the sensor is longer than the distance threshold value and/or wherein in the step of grouping, the third illumination unit is not grouped into the group of at least two adjacently arranged illumination units if a time during which the vehicle travels proceeding from exiting of the first illumination unit from the detection region of the sensor is greater than the time threshold value. - recognizing at least one first illumination unit in a detection region of a sensor and recognizing subsequent exiting of the first illumination unit from the detection region of the sensor; - beginning of measuring a distance travelled by the vehicle after exiting of the first illumination unit from the detection region of the sensor and/or beginning of measuring a time during which the vehicle travels after exiting of the first illumination unit from the detection region of the sensor; and - grouping the first illumination unit with a second illumination unit into the group of at least two adjacently arranged illumination units,