2011 Lexus IS 350 User Guide - Page 191

2-4. Using other driving systems CAUTION n To avoid inadvertent cruise control activation Keep the "ON-OFF" button off when not in use. n Situations unsuitable for dynamic radar cruise control Do not use dynamic radar cruise control in any of the following situations. Doing so may result in inappropriate control of speed and could cause an accident resulting in death or serious injury. l In heavy traffic l On roads with sharp bends l On winding roads l On slippery roads, such as those covered with rain, ice or snow l On steep downhills, or where there are sudden changes between sharp up and down gradients l At entrances to expressways l When weather conditions are bad enough that they may prevent the sensors from functioning correctly (fog, snow, sandstorm, etc.) l When the approach warning buzzer can be heard often l When your vehicle is towing anything n When the radar sensor may not be correctly detecting the vehicle ahead Apply the brakes as necessary when any of the following types of vehicles are in front of you. As the sensor may not be able to correctly detect these types of vehicles, the proximity alarm (→P. 492) will not be activated, and an accident may result. l Vehicles that cut in suddenly l Vehicles traveling at low speeds l Vehicles that are not moving l Vehicles with small rear ends (trailers with no load on board etc.) l Motorcycles traveling in the same lane 198