Transmitting data via LED

We know what you're thinking. Crazy flashing lights equals Pokemon-style seizures, but the Japanese scientists who have developed a method of communicating by flashing LED lights at extremely high rates that are faster than the human eye can possibly detect. They're investigating it as an alternative to using radio waves for position detection (which they is way too inaccurate and theoretically their LED
system is precise to within a few millimeters), and also for creating traffic signals which can beam information to your car.