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The drowsiness detector is an audio and visual alert system that detects a driver's drowsiness by monitoring their eyes, head position and eyelids. While the system itself is not activated until all three measurements are met, it can be deactivated before then when desired. The alert consists of a series of chimes that get increasingly louder as each measurement is made.
The lane keep assist system in your Lincoln Corsair uses a camera on the windshield to monitor the vehicle's position in relation to lane markers.