Lane change assistance system

The invention relates to a lane change assistance system in a vehicle (), wherein the lane change assistance system has a sensor arrangement for detecting the current surrounding area of the vehicle in each case and is designed to generate a warning signal and/or steering intervention when an imminent lane change by the vehicle is identified, depending on a second vehicle () being detected by the sensor arrangement in the vehicle's surrounding area. In this case the lane change assistance system is designed to suppress generation of the warning signal and/or the steering intervention based on map data (), particularly when the change of lane by the vehicle is to a newly opening lane () of a multiple lane road () which is branching off (e.g. of a corresponding motorway exit) and the second vehicle is located in another lane () of the road () which is branching off.