Sort of like these: https://www.reddit.com/r/nostalgia/comments/rac674/traffic_lights_used_for_noise_control_in_school/ https://www.reddit.com/r/nostalgia/comme

Sort of like these: https://www.reddit.com/r/nostalgia/comments/rac674/traffic_lights_used_for_noise_control_in_school/ https://www.reddit.com/r/nostalgia/comments/rac674/traffic_l...