Lexus 2004 LS430 Owner's Manual page 352

STARTING AND DRIVING
CAUTION
Under certain conditions where the vehicle in front
slows drastically, or is stopped, the dynamic radar/laser
cruise control will neither warn you nor decelerate. The
driver must depress the brake pedal to slow down,
ensuring collision avoidance
vehicle-to-vehicle distance is maintained.
When vehicle-to-vehicle distance control mode is activated,
you must still be attentive to road and traffic conditions. Should
your vehicle speed decrease below about 40 km/h (25 mph),
the dynamic radar/laser cruise control will shut off, requiring
you to apply the brakes to slow. When a vehicle ahead slows
suddenly, stops or a vehicle cuts in front, the system may slow
your vehicle abruptly, but the automatic braking will cease if the
speed decreases below about 40 km/h (25 mph) requiring the
driver's manual application of brakes.
332
Dynamic radar cruise control—
Certain conditions make vehicle detection difficult or
impossible.
or that sufficient
D As this system operates by detecting primarily the
reflected wave from the rear end of the vehicle ahead,
the distance cannot be accurately detected in the
following
vehicle-to-vehicle distance.
D The rear section of the vehicle ahead is extremely
small such as an unloaded trailer.
D The vehicle ahead or other vehicles around you
are flinging up water or snow.
D Heavy luggage which is loaded in your trunk or on
top of your rear seats is raising up the nose of your
vehicle.
CAUTION
cases, resulting in improper