Gagandeep Singh invented a display for the rear window of his car that can send messages to motorists within viewing range. Singh rigged up a 40 x 16 LED matrix display that he says doesn’t obstruct a driver’s view because small lights in the grid are only located every 2 cm with space between them. While using the display in its current state likely qualifies as distracted driving, Singh plans to make the device updatable via a mobile phone over Bluetooth. Other eye-grabbing inventions include a bike projector that projects an image of a bicycle onto the road ahead.”]
Source: https://www.csoonline.com/article/2129927/hacker-creates-new-way-to-communicate-road-rage.html