2011 Lexus IS 350 User Guide - Page 187

2-4. Using other driving systems Example of follow-up cruising When following a vehicle driving slower than the set speed The system continues follow-up cruising while adjusting for changes in the speed of the vehicle ahead in order to maintain the vehicle-to-vehicle distance set by the driver. Example of acceleration When there are no longer vehicles driving slower than the set speed in the lane ahead When the vehicle ahead of you executes a lane change, the system slowly accelerates until the set vehicle speed is reached. The system then returns to fixed speed cruising. Approach warning When your vehicle is too close to a vehicle ahead, and sufficient automatic deceleration via the cruise control is not possible, the display will flash and buzzer will sound to alert the driver. An example of this would be if another driver cuts in front of you while you are following a vehicle. Apply the brakes to ensure an appropriate vehicle-to-vehicle distance. n Warning lights, messages and buzzers for dynamic radar cruise control Warning lights, messages and buzzers are used to indicate a system malfunction or to inform the driver of the need for caution while driving. (→P. 492) n Switching modes The mode cannot be switched to constant speed control mode if vehicle-to-vehicle distance control mode has been used. The mode also cannot be switched from constant speed control to vehicle-to-vehicle distance control mode. Turn the system off by pressing the "ON-OFF" button, and turn it on again. n The dynamic radar cruise can be set when l The shift lever is in the D position or S position. However, it cannot be set if any of the ranges 1 through 3 has been selected. l Vehicle speed is more than approximately 30 mph (50 km/h). 194