How does blind spot detection work?

Blind spot detection (BSD) monitors areas alongside and behind the vehicle that are difficult for drivers to see. Typically uses short-range radar sensors mounted in rear corners. When a vehicle is detected in the blind spot zone, visual warnings (usually in side mirrors) alert the driver. Advanced systems add audible warnings if the turn signal is activated while a vehicle is in the blind spot. Some systems include rear cross-traffic alert, warning of vehicles approaching from the side when reversing. BSD significantly reduces lane change collisions. System calibration defines detection zones to minimize false alerts from guardrails or passing scenarios.