The Lyon Transport Company launched a project to improve risk prevention on the most dangerous metro platforms. For these platforms, each fall is fatal, and the risk is therefore at its maximum. Roiret Transport was assigned to carry out the study, formulate the solutions and integrate them. It’s in this context that our directional speaker solution was selected to deliver an alert message only to the commuters standing too close to the edge of the platform when the train approaches. When the commuter is in the risk zone, he is exposed to the sound shower that encourages him to back away. The challenge is also to avoid stressing other commuters who aren’t in the risk area, and who are therefore not affected by the alert message.
22 “A” directional speakers are installed 80 centimeters apart and mounted 2.20 meters from the ground to homogenize part of the platform. The target area is a strip 1 m wide and about 20 meters long to create a protective "sound shower". Our directional speakers are chained together and only trigger the alert message when a train approaches.