2004 Lexus LS 430 User Guide - Page 348

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 or that sufficient 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. Dynamic radar cruise control- CAUTION Certain conditions make vehicle detection difficult or impossible. 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 cases, resulting in improper 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. 330