Lexus 2004 LS430 Owner's Manual page 363

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If other vehicles are driving outside of the millimeter

wave radar or laser radar detection range, a delay in the

detection of the vehicle cutting in at short range or

detection failure of the motorcycle running on the side

of the same lane will occur. In this case, the dynamic

radar/laser cruise control system will not function

STARTING AND DRIVING

D When a slower vehicle in front of you leaves the lane,

the dynamic radar/laser cruise control will no longer

detect a vehicle ahead and will attempt to accelerate

the vehicle to the faster preset speed.

D When the vehicle-to-vehicle distance control is on

(on follow-up cruising), your cruising speed is

regulated in proportion to the speed of the vehicle

ahead, so increasing the preset vehicle speed using

the control lever does not accelerate the vehicle.

However, if the vehicle ahead leaves the lane, your

cruising speed will increase up to the preset speed

because the preset speed has been set higher using

control lever.

Confirm the setting on the

multi-information display.