Ummmm ..... Actually, the beacon is to identify cyclists to AV cars. Communication is with the car, not the driver.
As a rule, it doesn't hurt to read the cited article to actually know what one is talking about Before starting to talk.
I quote:
It is the goal of the “connected car” industry to make cyclists use sensors or beacons so they can be detected more easily. (Such sensors could be passive transponders or, even easier, signals from a smartphone.) Currently, "erratic" cyclists are hard to detect by autonomous vehicles. And pedestrians, too, are often not spotted by a plethora of detection devices on even the most tricked-out "driverless cars". (emphasis added, to make the point clear to the reading-averse.)