Smart Horn Systems in Connected Vehicles: A Pathway to Reducing Urban Noise Pollution

Connected Vehicle (CV) technology is transforming the landscape of modern transportation by enabling seamless communication between vehicles (V2V), infrastructure (V2I), and pedestrians (V2P). By leveraging wireless communication standards such as Dedicated Short-Range Communication (DSRC) and Cellular Vehicle-to-Everything (C-V2X), connected vehicles aim to enhance road safety, traffic efficiency, and environmental sustainability. However, one often-overlooked issue in urban environments—vehicular noise pollution, particularly from excessive horn usage—remains largely unaddressed by current CV systems. This research introduces a novel feature within the domain of V2V communication: an Interior-Only Audible Horn System. The proposed system enables vehicles within a defined vicinity to transmit horn signals wirelessly to one another, with the alert sound being played only inside the cabin of the target vehicle. As a result, pedestrians and nearby non-target vehicles are not disturbed by unnecessary horn noise, significantly reducing overall urban noise pollution. The system architecture incorporates onboard vehicle sensors, digital horn activation mechanisms, and secure short-range communication protocols. The horn signal is encapsulated as a digital alert packet, transmitted over the CV network, and decoded only by vehicles within the immediate alert zone. The paper also presents simulations and a prototype implementation demonstrating the system’s effectiveness in both reducing ambient horn noise and maintaining driver awareness and safety. This innovation represents a step forward in creating smarter, quieter, and more sustainable urban mobility ecosystems by combining environmental sensitivity with the growing potential of connected vehicle networks. Whenever we are walking on a footpath besides the roads, especially in the metropolitan cities, we hear annoying noise from the horns of cars, bikes, etc. This noise is very irritating, discomforting and Noise-Guard is a new age automobile horn system designed specifically to reduce noise pollution caused by the automobiles. The noise-guard circuit has to be installed in all automobiles in order to make it successful for noise pollution reduction. Through this system, any two or more nearby automobiles are connected to each other through radio communication system, just like the radio channels we tune in our cars to listen to songs. The traditional horn systems are placed at the center of a steering of an automobile. The same horn button is replaced by the button of the Noise-Guard. When a driver in one car presses “Noise-Guard” on his steering, a horn sound will be played inside the interior of each car that is connected to it. Every Noise Guard must be operating at the same radio frequency in order to receive alert from any nearby automobile. This way, we can reduce the noise pollution by about 30 to 50 percent. This system However, fancy this may seem, there are some loopholes in this system. What about the people who are crossing the road or just standing on the road? What about the bikes, bicycles, animals on the road? How can we alert such elements of the road traffic system? Therefore, while building such systems, we need to take care of these elements also. For this reason, “Noise-Guard” does not replace the traditional horn system; instead it adds an extra feature to the old system to make it futuristic.