2006 Lexus GS 300 Owners Manual - Page 423

STARTING AND DRIVING Dynamic radar cruise control should not be used in the following conditions, to avoid death or serious injury. D In bad weather (such as rain, fog, snow, sandstorms, or when raindrops or snowflakes get in the millimeter wave radar sensor or the cover), the vehicle−to−vehicle distance will not be measured accurately. If the wipers are operated at high speed (including the high speed operation with the wiper lever in the "AUTO" position), dynamic radar cruise control is automatically cancelled. (In the case of the low speed operation and intermittent wiper operation, it is not cancelled.) Dynamic radar cruise control is automatically cancelled when the measurement is extremely unstable due to bad weather. D On the roads in heavy traffic or at sharp bends: As an appropriate speed cannot be maintained, death or serious injury could result. D On slippery road surfaces (icy or snow−covered road surfaces): The tires will race and you will be unable to control. D On steep downhill slopes: If there is no vehicle detected ahead, the preset speed will be easily exceeded because of inefficient engine braking, resulting in death or serious injury. (In this case, automatic braking will not work.) If there is a vehicle detected ahead, the delay in deceleration timing could cause death or serious injury. D When the warning tone sounds frequently (because acceleration or deceleration was repeated or sufficient vehicle−to−vehicle distance was not maintained), an appropriate vehicle speed cannot be attained, resulting in death or serious injury. D On roads with steep and short inclines and declines, failure to detect the vehicle ahead will shorten the distance between your vehicle and the vehicle ahead, resulting in death or serious injury. 399