Lexus GS 350 Owner's Manual page 237

When driving on winding roads or roads that are uneven
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When driving on rough or unpaved roads
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When changing the tires
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Depending on the tires used, sufficient performance may not be maintainable.
Warning messages for LKA
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Warning messages are used to indicate a system malfunction or to inform the driver
of the need for caution while driving. (→P. 700, 708)
CAUTION
Before using the LKA system
■
Do not rely solely on the LKA system. The LKA system does not drive the vehicle
automatically, nor does it reduce the amount of care you need to take. As such, the
driver must always assume full responsibility for understanding his/her surround-
ings, for operating the steering wheel to correct the driving line, and for driving
safely.
Inappropriate or negligent driving could lead to an accident.
To avoid operating the LKA by mistake
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Switch the LKA off using the "LKA" switch when not in use.
Situations unsuitable for LKA
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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, tire chains, a spare tire, or similar equipment
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When the tires have been excessively worn, or when the tire inflation pressure is
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low.
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.)
When driving on snowy roads
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When pavement lane markers are difficult to see due to rain, snow, fog, etc.
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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 or
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highway
When driving on a road with lane closures due to maintenance, or when driving
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in a temporary lane
When emergency towing
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4-5. Using the driving support systems
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