Lexus LS460 2011 Owner's Manual page 294

2-4. Using other driving systems
CAUTION

Before using the LKA system
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 posi-
tion 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 equip-
ment.

When driving with non-standard parts or aftermarket equipment installed.
(including modified tires and suspensions, etc.)

When there are objects or structures along the roadside that might be mis-
interpreted 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 surface.

When there are shadows on the road running parallel with lane markers,
or if a shadow covers the lane markers.

When there are visible lines on the pavement from road repairs, or if the
remains of old lane markers are still visible on the road.

When driving on slippery roads, such as those covered with rain, ice or
snow.

When driving in a lane other than the driving or passing lanes on a free-
way, highway or motorway.

When driving on a road with lane closures due to maintenance, or when
driving in a temporary lane.

When driving on winding roads or roads that are rough or uneven.
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