Light projection device for a motor vehicle for support in a route guidance having: - a sensor for detecting an actual lane in which the motor vehicle is currently situated, wherein the sensor is in the form of a camera, - a navigation system for preparing a target lane, different from the actual lane, for the route guidance, - a control unit which calculates on the basis of the actual lane and the target lane an area to be illuminated, wherein the area to be illuminated has a greater expansion along a direction of travel of the motor vehicle than perpendicularly to the direction of travel and the area to be illuminated has a first partial region with a first area centre which is situated in the actual lane, wherein the first partial region extends across a total width of the actual lane and the area to be illuminated has a second partial region having a second area centre which lies on the target lane, wherein the second partial region extends across a total width of the target lane, - a projection unit which projects light correspondingly on the area to be illuminated calculated by the control unit, wherein - the area to be illuminated is configured in one piece and - the area to be illuminated in one piece leads from the actual lane to the target lane and the two lanes (16, 17) are not arranged directly adjacent to one another, characterised in that - the second partial region comprises more than 50% of the surface to be illuminated, - the sensor is able to detect, by means of an image processing, different road markings and a set of traffic lights in the vicinity of the motor vehicle, and the control unit is configured, and, - in the case of a change of lane prior to reaching the traffic lights, to take into consideration a status of the traffic lights when calculating the area to be illuminated. - a sensor for detecting an actual lane in which the motor vehicle is currently situated, wherein the sensor is in the form of a camera, - a navigation system for preparing a target lane, different from the actual lane, for the route guidance, - a control unit which calculates on the basis of the actual lane and the target lane an area to be illuminated, wherein the area to be illuminated has a greater expansion along a direction of travel of the motor vehicle than perpendicularly to the direction of travel and the area to be illuminated has a first partial region with a first area centre which is situated in the actual lane, wherein the first partial region extends across a total width of the actual lane and the area to be illuminated has a second partial region having a second area centre which lies on the target lane, wherein the second partial region extends across a total width of the target lane, - a projection unit which projects light correspondingly on the area to be illuminated calculated by the control unit, wherein - the area to be illuminated is configured in one piece and - the area to be illuminated in one piece leads from the actual lane to the target lane and the two lanes (16, 17) are not arranged directly adjacent to one another, - the second partial region comprises more than 50% of the surface to be illuminated, - the sensor is able to detect, by means of an image processing, different road markings and a set of traffic lights in the vicinity of the motor vehicle, and the control unit is configured, and, - in the case of a change of lane prior to reaching the traffic lights, to take into consideration a status of the traffic lights when calculating the area to be illuminated.