Lexus’ Pre-Collision System (PCS analyzes data from the optional Dynamic Radar Cruise Control system and combines it with information on vehicle speed, steering angle, and yaw rate. After analysis is performed, the computer determines if a crash is about to happen and, if necessary, immediately activates the pre-tensioning front seatbelts, drawing the belts tightly against the occupants and snugging them tight against the seatbacks. PCS also readies the brake assist feature to apply full braking power and reduce speed as much as possible before impact to minimize the amount of force that might reach the passenger compartment. On vehicles with Adaptive Variable Suspension (AVS), the PCS also reduces nose dive to make more efficient use of the brake assist system.

To let us experience PCS first-hand, Lexus engineers crafted a lightweight, deformable barrier that looked like it was covered in aluminum foil and which wouldn’t damage the car upon impact but would trick the safety feature into activating. It took several passes in a Lexus GS 430 to get PCS to work, but that was mainly because in this safe, controlled environment we weren’t easily able to replicate the panicked motions of a driver about to do serious sheet metal damage. But when the system finally did perform its trick, it responded powerfully, instantaneously, and impressively.

When PCS activates, the seatbelts snap into action, cinching your body tight against the seat, while the brake assist system feels like it’s tossed an anchor out of the trunk the moment your foot jams down on the brake pedal. Once the GS shuddered to a stop, the shiny barrier rolling around in front of it like a fallen alien pedestrian, the seatbelts whirred, clicked, and released, freeing us to make another pass for more ooohs and aaahs. The system reacts more violently than Acura’s CMBS, but it also operates only when a collision is going to occur, rather than when one might occur. We only wish Lexus included some kind of automatic braking feature like the Acura.

PCS requires the optional Dynamic Radar Cruise Control system and is available on the Lexus GS 300 and GS 430 for $2,850. On the Lexus LS 430, PCS is bundled with the $8,185 Custom Luxury package or the $13,570 Ultra Luxury package. That’s a pricey insurance policy, especially when Lexus currently has very little real-world data to support the theory that it can save lives.