A method for monitoring a setpoint trajectory to be traveled by a vehicle for being collision free, including carrying out a clearance measurement of vehicle surroundings with the aid of a surroundings sensor system to determine a clearance in the vehicle surroundings, carrying out an object measurement of the vehicle surroundings with the aid of the surroundings sensor system to determine objects in the vehicle surroundings, checking the setpoint trajectory for being collision free based on the determined clearance and the determined objects, and comparing particular results of the checks for being collision free to one another, an item of collision information being provided based on the comparison.