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Advanced safety systems
The fourth generation Lexus LS incorporates multiple new active and passive safety features. The comprehensive active safety feature on the Lexus LS, the Lexus Pre-Collision System (PCS), now utilizes millimeter-wavelength radar, stereo cameras, and infrared night vision projectors to prevent accidents. This system, called "Pre-Crash" internationally, includes an obstacle detection and warning system with the first automotive implementation of an image processing chip capable of identifying vehicles, pedestrians, and lane markers in real time.[58][59] With this capability, PCS features the Driver Monitoring and Lane Keeping Assist systems, Emergency Steering Assist, and the frontal and rear Pre-Crash response systems:

The Lexus Driver Monitoring System.
Diagram of the LS Driver Monitoring System.The Driver Monitoring System uses a CCD camera placed on the steering column to track driver attentiveness by eye tracking.[60] Using infrared LED detectors, this system will respond if a collision is imminent and the driver not paying attention (a warning alarm will sound followed by a brief automatic application of the braking system).[61] This system is said to be the first of its kind.[60] In the U.S., the Driver Monitoring System will debut on the LS 600h L sedan.[51]
The Lane Keeping Assist feature includes the Lane Departure Warning (LDW) and Lane Keep (LK) systems. When activated, the LDW system will issue an audiovisual warning and apply a brief corrective steering response when veering motion is detected. The LK system (activated when the adaptive cruise control is engaged) will actively provide continued steering inputs to return the LS to its proper lane.[61]
The Emergency Steering Assist system acts to minimize body roll and improve vehicle responsiveness in sudden maneuvers. This system reduces the steering gear ratio and prompts the suspension to adopt stiffer settings,[61] helping make emergency maneuvers more stable and controlled.
The Frontal Pre-Crash system will activate a warning buzzer and red dash lights to alert the driver if a potential hazard is detected in the vehicle's path. If the system detects a potential collision, the Emergency Steering Assist and brake assist systems will activate, increasing effectiveness in emergency maneuvers and stopping. If a collision is determined to be unavoidable, the seatbelt pretensioners will activate, and the brakes will automatically engage to slow the vehicle.[61]