Lexus LS460 2011 Owner's Manual page 295

2-4. Using other driving systems
CAUTION

In the following situations, the LKA will not work, or will not perform reli-
ably:

When lane markers are interrupted or are not present, such as before a
tollbooth (tollgate).

When lane markers are only on one side of the road.

When driving on a sharp curve.

When lanes are extremely narrow or extremely wide.

When the vehicle leans to one side an unusual amount due to a heavy load
or improper tire inflation pressure.

When the following distance between your vehicle and the vehicle ahead
is extremely short.

When the lane markers are broken or faint.

When lane markers are obscured or partially obscured by sand, dirt, etc.

When driving on a particularly bright road surface, such as concrete.

When driving on a road surface that is bright due to reflected light.

When driving in a location where the light level changes rapidly, such as
the entrance to or exit from a tunnel.

When sunlight or the headlights of oncoming vehicles are shining directly
into the camera lens.

When driving on roads that are branching or merging.

When pavement lane markers are difficult to see due to rain, snow, fog,
etc.

When driving on a road surface that is wet due to rain, previous rainfall,
standing water, etc.

When the vehicle experiences strong up-and-down motion such as when
driving on an extremely rough road or on a seam in the pavement.

When headlight brightness is reduced due to dirt on the lenses, or when
the headlights are misaligned.

When driving with a strong crosswind.
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