2004 Lexus LS 430 User Guide - Page 352

STARTING AND DRIVING 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 serious injury or death. (In this case, automatic braking will not work.) If there is a vehicle detected ahead, the delay in deceleration timing could cause serious injury or death. 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 serious injury or death. 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 serious injury or death. Dynamic radar/laser cruise control- 31L361a Dynamic radar/laser cruise control should not be used in circumstances which are inappropriate for any cruise control such as entering freeway on-ramps or off-ramps. CAUTION The dynamic radar/laser cruise control should not be used when exiting from, or when entering or merging onto a freeway. When you are following a slower moving vehicle and exiting, the sensor does not detect the vehicle and will accelerate to preset speed. 334