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Iron Imperative
Car honk uses acoustic laser (saser) to alert one person only.
Inspiration from Nature
Antennas of Drosophila Melanogaster can block out irrelevant sounds to focus on relevant ones.

Problem Statement
Car honking not only implies a superior degree of urgency but is also inconsiderate of the surrounding. While there could be a justification for the first reason, there is none for the second. A person who is not in one’s way should not be bothered by it. A horn technology needs to be invented which alerts only a given person.
Nature Review
Many animals have evolved Cocktail Effect (ability of selective hearing). But perhaps the finest way of target-hearing is demonstrated by fruit fly (Drosophila Melanogaster). Its antennas have dedicated protrusions which work as sound receivers that can block out the noise to focus on a given sound. This natural strategy directs us in two different ways to approach the problem. First one is a matter of legislation because it concerns all car manufacturers. In this method, all cars would be required to install both transmitter and receptor of a wave (light, sound, infrared etc.). This way, all cars could communicate without making noise. But this method has a drawback that it doesn’t address pedestrians (or animals) on the road. That can be solved in second option which requires reimagining the honking system of a car altogether.
Technology Review
Directional sound-wave has already been invented. It is called Saser, an acoustic laser which generate tetra-hertz sound waves. Similarly, parametric sound speakers, directional speakers, SoundLazer VR directional speakers and Snap Speaker Beam technology are all good examples to start with. What’s needed is an integration of these technologies with (automatic and manual) car navigation systems.

Nature Gadgets Umair Zia Nature-Gadgets-Umair-Zia NatureGadgets UmairZia
Nature Gadget
A Saser-based horn system (8, 9) is designed to communicate with a certain pair of ears only (10). The system is integrated with front and rear cameras (12) and can be set to auto setting in order to alarm the obstacle in front (or potential obstacle approaching from behind). The system creates infrared imagery (8) on the road which can distinguish between different sources of heat. The person causing negligence is hit by an acoustic laser (1) which no one else can hear.
Citation Montage
Following are some useful resources from the design process of this nature gadget.
Row1Column1: Closeup of a Fruit Fly
Row1Column2: Closeup of Auditory Organ of Fruit Fly
Row1Column3: History of Car Horns
Row1Column4: A Polite Car Horn
Row2Column1: Selective Auditory Attention
Row2Column2: Google’s Driverless Car Learns to Honk at Bad Motorists
Row2Column3: Saser- An Accoustic Laser that Produces Terahertz Sound Wave
Row2Column4: Laser and Sound Systems in SLAPGadgets
Row3Column1: Sound Laser, the Key to Manipulate Nanoparticles
Row3Column2: Auditory System of Fruit Fly
Row3Column3: Parametric Speakers
Row3Column4: Sound Amplification by Stimulated Emission of Radiation
Row4Column1: Speakers which Direct the Sound Like a Laser Beam
Row4Column2: Directional Speakers
Row4Column3: SoundLazer VR Directional Speaker
Row4Column4: SoundLazer Snap Speaker Beam
Suggested Additionally: The Ultimate Guide on How to Get Rid of Flies

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