Lexus LS460 2011 Owner's Manual page 272

2-4. Using other driving systems

Adaptive cruise control with full-speed range can be set when

The shift lever is in the "D" or range "4" or higher of "S" has been
selected.
(without paddle shift switches)

The shift lever is in "D".
(with paddle shift switches)

Range "4" or higher of "D" has been selected by using the paddle shift.
(with paddle shift switches)

Vehicle speed is above approximately 50 km/h (30 mph).

Accelerating after setting the vehicle speed
The vehicle can accelerate normally. After acceleration, the set speed
resumes.
However, during vehicle-to-vehicle distance control mode, the vehicle
speed may decrease below the set speed in order to maintain the distance to
the vehicle ahead.

Automatic cancelation of vehicle-to-vehicle distance control
Vehicle-to-vehicle distance control driving is automatically canceled in the
following situations:

Actual vehicle speed falls below approximately 40 km/h (25 mph) when
there are no vehicle ahead.

There are no longer vehicles ahead when actual vehicle speed is below
40 km/h (25 mph).

VSC is activated.

The sensor cannot operate correctly because it is covered in some way.

The windshield wipers are operating at high speed (when the wiper
switch is set to the "AUTO" mode or the high speed wiper operation
position).

When snow mode is set.

The parking brake is operated.

The vehicle is stopped by system control on a steep incline.

Pre-crash brake assist is activated.
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