In Mumbai, India, pressing the horn is a real scourge. Drivers clicked their horns unnecessarily even when the traffic light is red. The communication agency FCB Interface and the local police found a solution for education and awareness of motorists who are constantly using their horns. Volume gauges installed on some traffic lights. When the sound level reaches 85 dB, The countdown of the red lantern is reset to 90 seconds and drivers expect even more.