Pre-Collision System, Lexus: Available on all models except GX, RX, and SC, as a $2,850 option along with Dynamic Radar Cruise Control, this system employs millimeter-wave radar projected from the front of the vehicle to determine when a frontal collision is unavoidable. Then, it activates the front seatbelt and boosts the brakes. If the driver responds quickly, everything is relaxed again. In Japan, this system is coupled with another piece of advanced technology that creates a "pre-pre-collision" device. That starts with two cameras mounted in the steering wheel that track the attentiveness of the driver by monitoring the position of features such as the tip of his nose and his eyebrows. If he seems to wander from straight ahead, a light flashes on the instrument panel, a beep sounds, the car prepares itself for braking and the shocks stiffen up. "That really gets the driver's attention if he's playing with his iPod or looking at a road sign," said Paul Williamsen, national manager of Lexus College, which trains the brand's personnel.