2004 Lexus LS 430 User Guide - Page 359

STARTING AND DRIVING CAUTION 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 the control lever. Confirm the setting on the multi-information display. 31L588 CAUTION 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 properly. 341