Abstract: Road safety installation with emission of sound messages for every type of signalling panel fixed along a road, including a fixed emitter device emitting a coded infrared radiation signal corresponding to the type of signalling panel to which it is associated for every signalling panel along a road and on every vehicle circulating along the road, a receiver device receiving the coded infrared radiation signal (i) delivered by the fixed emitter device on every vehicle and converting the signal into a clear sound message emitted for the attention of the driver of the vehicle; the emitter device feeds an infrared radiation emitter via an encoder, so that the fixed emitter device delivers, in the direction of the vehicles arriving on the road, the coded infrared signal, and a second sensor controlling a normally open switch which is closed in order to start the emitter device in operation, when the sound sensor perceives the noise emitted by the vehicle, and the receiver device comprises an infrared radiation sen