Lexus ES 300h User Manual page 223

Hands off steering wheel alert
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When the system determines that the driver has removed the hands from the steering
wheel while the steering control function is operating, a warning message is displayed on
the multi-information display.
If the driver continues to keep their hands off of the steering wheel, the buzzer sounds, a
warning message is displayed and the function is temporarily canceled. This alert also
operates in the same way when the vehicle is driven with the steering wheel lightly
gripped. However, depending on the road conditions, etc., the function may not cancel.
White (yellow) lines are only on one side of road
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The LDA system will not operate for the side on which white (yellow) lines could not be
recognized.
Conditions in which functions may not operate properly
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In the following situations, the camera sensor may not detect white (yellow) lines and var-
ious functions may not operate normally.
There are shadows on the road that run parallel with, or cover, the white (yellow) lines.
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The vehicle is driven in an area without white (yellow) lines, such as in front of a tollgate
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or checkpoint, or at an intersection, etc.
The white (yellow) lines are cracked, "Raised pavement marker" or stones are present.
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The white (yellow) lines cannot be seen or are difficult to see due to sand, etc.
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The vehicle is driven on a road surface that is wet due to rain, puddles, etc.
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The traffic lines are yellow (which may be more difficult to recognize than lines that are
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white).
The white (yellow) lines cross over a curb, etc.
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The vehicle is driven on a bright surface, such as concrete.
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The vehicle is driven on a surface that is bright due to reflected light, etc.
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The vehicle is driven in an area where the brightness changes suddenly, such as at the
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entrances and exits of tunnels, etc.
Light from the headlights of an oncoming vehicle, the sun, etc. enters the camera.
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The vehicle is driven where the road diverges, merges, etc.
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The vehicle is driven on a slope.
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The vehicle is driven on a road which tilts left or right, or a winding road.
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The vehicle is driven on an unpaved or rough road.
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The vehicle is driven around a sharp curve.
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The traffic lane is excessively narrow or wide.
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The vehicle is extremely tilted due to carrying heavy luggage or having improper tire
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pressure.
The distance to the preceding vehicle is extremely short.
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The vehicle is moving up and down a large amount due to road conditions during driv-
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ing (poor roads or road seams).
The headlight lenses are dirty and emit a faint amount of light at night, or the beam axis
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has deviated.
The vehicle is struck by a crosswind.
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The vehicle has just changed lanes or crossed an intersection.
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Snow tires, etc. are equipped.
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ES300h_OM_OM33C75U_(U)
4-5. Using the driving support systems
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