2006 Lexus RX 400h Owners Manual - Page 474

STARTING AND DRIVING Conventional cruise control mode This mode allows you to cruise at constant speed over about 45 km/h (28 mph) with your foot off the accelerator pedal. Within the limits of the hybrid system's capabilities, cruising speed will be maintained up or down grades. Because speed changes will increase in proportion to grade, cruise control should not be used on steeper hills. D Do not use the conventional mode in the following conditions, or serious injury or death could result: To help maintain maximum control of your vehicle, do not use conventional cruise control mode when using dynamic laser cruise control while driving in heavy or varying traffic, or on slippery (rainy, icy or snow−covered) or winding roads. Avoid vehicle speed increasing when driving downhill. If the vehicle speed is too fast in relation to the preset speed in the conventional cruise control mode, cancel the conventional cruise control mode and then downshift the transmission to use engine braking to slow down. CAUTION D In the conventional cruise control mode, the approach warning does not activate and no alarm will sound even if you are too close to the vehicle ahead, as neither the presence of the vehicle ahead nor the vehicle−to−vehicle distance is detected. Pay special attention to the distance between your vehicle and the vehicle ahead. Always confirm the cruise control mode on the display. 438