(Lane-Keeping Assist) - Lexus GS 350 Owner's Manual

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4-5. Using the driving support systems
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LKA (Lane-Keeping Assist)
Summary of functions
While driving on a freeway or motor highway that has lane markers and
no sharp curves, the system recognizes the lanes using a camera located
above the inside rear view mirror as a sensor to assist the driver with stay-
ing in the lane. The LKA system has two functions.
Camera sensor
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: If equipped