Toyota LEXUS LS430 2005 Manual page 357

STARTING AND DRIVING
Dynamic laser cruise control should not be used in the
following conditions, to avoid serious injury or death.
D In bad weather (such as rain, fog, snow, sandstorms
or direct sunlight, or when raindrops or snowflakes
get in the laser
vehicle−to−vehicle distance will not be measured
accurately.
If the wipers are operated at high or low speeds
(including the high and low speed operation with the
wiper lever in the "AUTO" position), dynamic laser
cruise control is automatically cancelled. (In the case
of intermittent wiper operation, it is not cancelled.)
Dynamic laser cruise control is automatically
cancelled when the measurement is extremely
unstable due to bad weather.
D On the roads in heavy traffic or at sharp bends:
As an appropriate speed cannot be maintained,
serious injury or death could result.
D On slippery road surfaces (icy or snow−covered road
surfaces):
The tires will race and you will be unable to control.
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radar sensor glass), the
D On steep downhill slopes:
If there is no vehicle detected ahead, the preset speed
will be easily exceeded because of inefficient engine
braking, resulting in serious injury or death. (In this
case, automatic braking will not work.) If there is a
vehicle detected ahead, the delay in deceleration
timing could cause serious injury or death.
D When the warning tone sounds frequently (because
acceleration or deceleration was repeated or
sufficient vehicle−to−vehicle distance was not
maintained), an appropriate vehicle speed cannot be
attained, resulting in serious injury or death.
D On roads with steep and short inclines and declines,
failure to detect the vehicle ahead will shorten the
distance between your vehicle and the vehicle ahead,
resulting in serious injury or death.