Lexus 2003 LS Owner's Manual page 271

CAUTION
A Dynamic laser cruise control should not be used in
the following conditions, to avoid serious injury or
death.
A In bad weather (such as rain, fog, snow,
sandstorms or direct sunlight, or when raindrops
or snowflakes get in the laser radar sensor glass),
the 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.
A On the roads in heavy traffic or at sharp bends:
As an appropriate speed cannot be maintained,
serious injury or death could result.
A On slippery road surfaces (icy or snow–covered
road surfaces):
The tires will race and you will be unable to control.
STARTING AND DRIVING
A 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.
A When the warning tone sounds frequently
(because acceleration or
repeated or sufficient vehicle–to–vehicle distance
was not maintained), an appropriate vehicle speed
cannot be attained, resulting in serious injury or
death.
A 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.
deceleration was
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