Vehicle Guidance System and Method for Operating a Driving Function in Different Modes

A vehicle guidance system provides a driving function for automated longitudinal guidance of a vehicle. The vehicle guidance system is designed to determine data relating to a first signaling unit located ahead in the travel direction of the vehicle. Furthermore, the vehicle guidance system is designed to operate the driving function in an automatic mode or in a manual mode at the first signaling unit depending upon the data relating to the first signaling unit, and in the automated longitudinal guidance of the vehicle the first signaling unit is taken into account automatically in the automatic mode, and in the manual mode only after confirmation by a user.