Assistance system for a vehicle, in particular a commercial vehicle

The invention relates to an assistance system () configured to be installed in an ego vehicle () and support a driver of the ego vehicle () in avoiding a collision of the ego vehicle () with another vehicle (), the assistance system () being configured to monitor an environment () of the ego vehicle () and detect the other vehicle () approaching the ego vehicle (). The assistance system () is configured to determine that the driver of the ego vehicle () is about to perform a turning maneuver () of the ego vehicle () towards a driver's side () of the ego vehicle (). The assistance system () is configured to determine the risk of a collision resulting from the turning maneuver (), between the ego vehicle () and the other vehicle ().