"Maybe such beacons could emit light/sound as well, when they're actively talking to a car, rather than the car itself having to emit noise" The noise is suppo

"Maybe such beacons could emit light/sound as well, when they're actively talking to a car, rather than the car itself having to emit noise" The noise is supposed to tell other road users where the car is, how would this help, except to tell road users that there is a car on a junction.