Abstract: A traffic signal system for blind people which can be combined with an existing traffic signal device the device having a sound signal generator electrically connected to a blue light of the pedestrian traffic signal device for generating a signal representative of imitation sound synchronous with lighting of said blue light, a noise detector, a volume controller for controlling the output of the signal generator in accordance with the detected noise signal of the noise detector, a control gate for preventing the noise signal of said noise detector from being supplied to the volume controller when the generator is on, and a speaker for emitting imitation sound having a volume corresponding to the level of the surrounding noise.