Disclosed is a road sign plate comprising: a base plate (2); a series of LEDs (4) disposed on said base plate; and power-supply means connected to said series of LEDs. In particular, the road sign plate comprises: a first resin layer (1) that covers at least the base plate (2); and a second resin layer (7) disposed on said first resin layer, said second resin layer (7) being of a translucent material. The road sign plate is a low cost plate, with high electro-mechanical strength and improved translucency properties.