1. An apparatus for assisting safe operation of a vehicle, the vehicle having a vehicle environment, the apparatus comprising: an environment sensor system, operable to detect hazards within the vehicle environment and to provide hazard data; a driver monitor, operable to provide driver awareness data, the driver awareness data including a gaze track; and an attention-evaluation module, identifying perceived hazards and unperceived hazards by comparing the hazard data and the gaze track, the attention-evaluation module providing an alert signal relating to the unperceived hazards.