2006 Lexus RX 400h Owners Manual - Page 463

STARTING AND DRIVING On slippery road surfaces (icy or snow−covered road surfaces), the tires will race and you will be unable to control the vehicle. When there is no vehicle detected ahead on steep downhill slopes, the preset speed will be easily exceeded because of inefficient engine braking. (In this case, automatic braking will not work.) If there is a vehicle detected ahead, a delay in deceleration timing could cause serious injury or death. When the alarm sounds frequently (because of frequent changes of speed or insufficient vehicle−to−vehicle distance), this indicates that the system cannot maintain an appropriate vehicle−to−vehicle distance and an accident may occur. 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 and an accident may occur. D Deceleration cruising function and approach warning do not operate when the vehicle ahead is at a stop or driving very slowly. D If the vehicle ahead of you decelerates abruptly or if another vehicle cuts in ahead of you, your vehicle may collide with the vehicle ahead unless you manually depress the brake pedal to slow down your vehicle. D Depending on the road configuration (curved, left and right continuous curved, the start or end of a curve, or narrow driving lanes due to road construction) or your vehicle condition (steering wheel maneuvering, position in the lane, or unstable driving because of an accident or breakdown), vehicles in other lanes or surrounding objects may be detected, resulting in a control failure or the approach warning activation. This may also result in a very close distance between vehicles due to a failure to detect the vehicle ahead. 427