Lexus 2004 LS430 Owner's Manual page 356

STARTING AND DRIVING
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
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.
336
Dynamic radar/laser cruise control—
distance was not
Dynamic radar/laser cruise control should not be used in
circumstances which are inappropriate for any cruise control
such as entering freeway on-ramps or off-ramps.
The dynamic radar/laser cruise control should not be
used when exiting from, or when entering or merging
onto a freeway.
moving vehicle and exiting, the sensor does not detect
the vehicle and will accelerate to preset speed.
31L361a
CAUTION
When you are following a slower