Lexus GS430 User Manual page 438

STARTING AND DRIVING
CAUTION
Braking control will not ensure that your vehicle will
reduce speed appropriately. Do not rely on dynamic
radar cruise control to prevent collision.
414
(f) Approach warning
G31018
CAUTION
While you are cruising in the vehicle−to−vehicle
distance control mode, if the vehicle ahead decelerates
abruptly or if another vehicle cuts in ahead of you,
inadequate braking will make your vehicle closer to the
vehicle ahead of you and the multi−information display
flashes and beeps. The driver must depress the brake
pedal to slow down, ensuring collision avoidance or
that sufficient vehicle−to−vehicle
maintained.
distance is