Designer Gagandeep Singh has created an LED matrix that goes over the rear windshield of your car, and can be used to display messages via Bluetooth display messages via Bluetooth. The tiny LEDs are spaced 2 cm apart, so the driver can still see out the window (although visibility may be impacted at night if all the LEDs are lit up). The system can only do preset messages now, like “KEEP DISTANCE” and “TURNING RIGHT,” but we hope they’ll soon have custom stuff like “GET OFF YOUR DAMN PHONE” and “WAY TO CUT ME OFF D-BAG.” Go here for a breakdown of the LED matrix and a demo video.