
When activated, an available Lane Keep Assist system [1] applies steering torque to help the vehicle stay in the center of the lane (provided of course you're on a road with clearly marked lines).
To help keep you from drifting out of your lane when cruise control is in operation, an available Lane Departure Warning System [2] gives an audible warning. After this warning, it takes corrective steering action to help keep you in your lane. When cruise control is not engaged, the system sounds a warning if you drift out of your lane.