Subaru Forester EyeSight 2015 Owner's Manual page 66

Lane Sway Warning
Wandering detection is based on several minutes of driving data. Wander-
ing will not be detected immediately when it occurs. In addition, the warn-
ing may continue for some time even after wandering stops.
The Lane Sway Warning System may also issue a warning when the driver
is tired, not concentrating on the road or otherwise not paying adequate
attention to driving. It is recommended that you be sure to take rest breaks
as often as needed.
When the Lane Departure Warning OFF indicator light is illuminated, Lane
Sway Warning is inactive.
* Refer to page 60.
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NOTE