An automotive safety feature that alerts drivers when a vehicle is coming up from behind at a fast clip but has not yet reached their side view mirrors. A blind spot alert is also sounded when the turn signal indicator is employed and a car is in the blind spot. As of 2019, cars employ radar, but LIDAR may be used in the future. See automotive safety systems
Blind Spot Information (BSI) System
These icons flash when radar sensors underneath the rear bumpers in this 2017 Honda CR-V detect a fast vehicle entering the blind spot or when passing a vehicle in the blind spot. An audible alert is given when drivers have their turn signal on and a vehicle is in the blind spot.