2006 Lexus RX 400h Owners Manual - Page 461

STARTING AND DRIVING If a vehicle is detected ahead of you - 2 4 Deceleration cruising function: If a slower moving vehicle is detected ahead of you, your vehicle cruising speed decreases within the range of about 40 km/h (25 mph) to 135 km/h (85 mph). The display shows the preset speed, the detected vehicle ahead and the selected vehicle−to−vehicle distance. If your vehicle gets closer to the vehicle ahead because of insufficient automatic deceleration, an alarm warns you to manually apply brakes. Follow−up cruising function: After deceleration, your cruising speed changes to match the speed of the vehicle ahead in order to maintain a constant vehicle−to−vehicle distance. The vehicle−to−vehicle distance can be changed. For details, see "(h) Changing vehicle−to−vehicle distance" on page 432. Acceleration cruising function: If the vehicle ahead changes lanes, your vehicle cruising speed will be gradually increased up to the preset speed, and your vehicle resumes fixed−speed cruising. This system operates by detecting primarily the reflectors of the vehicle ahead. The distance may not be accurately or absolutely detected in the following cases: D The vehicle ahead has higher ground clearance, which means that the placement of the reflectors is in a higher position. D The rear section of the vehicle ahead is extremely dirty. D The vehicle ahead or other vehicles around you are flinging up water or snow. D Excessive exhaust gas (black smoke) is coming from the vehicle ahead or other vehicles around you, obscuring your front view. D There is an obstruction (protective film, sticker, etc.) on the reflectors on the vehicle ahead, or reflectors are not installed on the vehicle ahead or are damaged. D Heavy luggage in the luggage compartment or rear seats is causing the nose of your vehicle to tilt up. 3 425