2005 Lexus RX 330 Owners Manual - Page 451

STARTING AND DRIVING 4 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. CAUTION To avoid accidents, always keep the laser radar sensor glass clean and never allow it to be covered with icicle or any substance, so it can detect the vehicle in front. (See "(k) Laser radar sensor" on page 429.) 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. 420