Lexus LS 600h L 2012 Owner's Manual page 265

2-4. Using other driving systems
CAUTION
Before using the LKA system
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Do not rely on the LKA system to remain within a selected lane. The LKA system is
not designed to enable inattentive driving. The steering wheel should be operated
by the driver to maintain the vehicle in a suitable position within its lane. Always
drive carefully.
Turn the LKA off while driving in any of the following conditions:
■
Do not use LKA in any of the following situations. Otherwise, the system may not
function correctly and could result in an accident.
When driving with snow tires, snow chains, a spare tire, or similar equipment.
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When driving with non-standard parts or aftermarket equipment installed.
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(including modified tires and suspensions, etc.)
When there are objects or structures along the roadside that might be misinter-
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preted as lane markers. (such as guardrails, curb, reflector posts, etc.)
Where there are wheel ruts, icy trademarks, etc. or if snow remains on the road
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surface.
When there are shadows on the road running parallel with lane markers, or if a
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shadow covers the lane markers.
When there are visible lines on the pavement from road repairs, or if the remains
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of old lane markers are still visible on the road.
When driving on slippery roads, such as those covered with rain, ice or snow.
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When driving in a lane other than the driving or passing lanes on a freeway, high-
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way or motorway.
When driving on a road with lane closures due to maintenance, or when driving
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in a temporary lane.
When driving on winding roads or roads that are rough or uneven.
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