Lexus LS500h, Manual, Page: 238 / 524

238
4-5. Using the driving support systems
LS500h_OM_(U)_1810
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Lane centering function
This function is linked with dynamic
radar cruise control with full-speed
range and provides the required assis-
tance by operating the steering wheel
to keep the vehicle in its current lane.
When dynamic radar cruise control with
full-speed range is not operating, the lane
centering function does not operate.
In situations where the white (yellow) lane
lines are difficult to see or are not visible,
such as when in a traffic jam, this function
will operate to help follow a preceding
vehicle by monitoring the position of the
preceding vehicle.
If the system detects that the steering
wheel has not been operated for a fixed
amount of time or the steering wheel is not
being firmly gripped, a warning is displayed
on the multi-information display and the
warning buzzer sounds. Make sure to grip
the steering wheel firmly.
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Lane change assist function (vehi-
cles with Lexus Safety A)
This function is linked to the dynamic
radar cruise control with full-speed
range and provides assistance for per-
forming lane changes by operating the
steering wheel when you hold the turn
signal lever partway (lane change posi-
tion).(

P.182)
When lane change assist function is
operating, the acceleration and decel-
eration of the vehicle is controlled
while the preceding vehicle and vehi-
cles driven in the lane toward which the
turn signal is operated are monitored.
When the lane centering function is not
operating, the lane change assist function
will not operate.
The lane change assist function should not
be operated when changing lanes on a
road that is diverging or merging.