Traffic intersections

Traffic intersections are places with high frequent movement of travellers and even today we can see many Digital communication medias to achieve maximally coordinated and fluent travellers check-in.

Directional sound can be used for targeted communication into the waiting room and locations, where the travellers are waiting for departure. Usage of this approach wouldn't distrub the travellers with unasked and needless info on todays train(and other) stations.