Who Invented the Car Horn? The Full History of the Noise

One patent in 1908, a Greek word for shriek, and a century of cars trying to get your attention.

Every car on the road carries a device invented to be deliberately unpleasant. That was the whole design brief. Here is where the car horn came from, who built the first one that mattered, and how we got from a hand-squeezed rubber bulb to a 130 decibel programmable car horn that plays whatever sound you load onto it. This is the car horn history in order, with the dates and the names that actually check out.

Before the Horn: Bells, Bulbs and Shouting

The first cars borrowed their warning devices from carriages and bicycles. Hand bells. Whistles. And the squeeze bulb horn, a rubber ball attached to a brass trumpet that you squashed with your palm, which stayed popular on early automobiles well into the 1920s.

The problem was obvious to anyone standing in traffic. These things sounded like instruments. Pleasant, musical, easy to ignore. A warning that blends into the street is not much of a warning.

1908: The Klaxon, and the Man Who Made Cars Shriek

The modern car horn starts with Miller Reese Hutchison, an American electrical engineer who patented the klaxon mechanism in 1908. Hutchison had watched traffic build up in New York and worked out the thing nobody else had said out loud: the warning needed to be annoying. Not just louder. Harsher. A sound your brain refuses to file away as background.

His mechanism was clever and brutally simple. A spring-steel diaphragm with a rivet in the centre sits against a rotating cogwheel. The teeth strike the rivet over and over, the diaphragm buzzes, and a flared horn aims the racket forward. Early versions were cranked by hand or spun by a small electric motor.

He licensed the patents to the Lovell-McConnell Manufacturing Company of Newark, New Jersey. Their founder, Franklyn Hallett Lovell Jr., named it the Klaxon, from the Ancient Greek verb klazo, meaning "I shriek". Nobody has ever named a product more accurately.

Klaxons were fitted to cars and bicycles from 1908, running first on six-volt dry cells and from 1911 on rechargeable batteries. United Motors bought Lovell-McConnell in 1916, and the klaxon became standard equipment on General Motors cars. Hutchison went on to become chief engineer for Thomas Edison, which tells you he was not a one-idea man.

That ah-OO-gah is still instantly recognisable over a century later. We covered the sound itself in the klaxon horn guide.

How the Ahooga Became the Beep

The klaxon had moving parts that wore out, and it was expensive to build. The industry moved to the electric horn still used today: an electromagnet vibrating a flat diaphragm, no cogwheel, nothing to grind. Cheaper, more reliable, and far more polite. That politeness is why your car sounds the way it does now.

Here is where the volume actually sits, measured:

Decibels are logarithmic, so those gaps are wider than they look on paper. The full breakdown is in our loudest car horn comparison. It is also why a modern novelty car horn gets specced in decibels rather than adjectives.

The Horn Goes Musical

Composers worked out early that a car horn is just a very rude instrument.

George Gershwin scored four taxi horns into An American in Paris in 1928. A year later, American composer Henry Fillmore built the klaxophone: twelve tuned car horns mounted on a table and powered by a car battery, written into his march "The Klaxon: March of the Automobiles" for the Cincinnati Automobile Show that opened in January 1930. The score carries a dedication to the makers of Klaxon horns. Decades later, Gyorgy Ligeti opened his opera Le Grand Macabre with Car Horn Preludes scored for twelve tuned bulb horns.

Out on the street the same idea arrived through lowrider culture, where multi-trumpet air horns honked out La Cucaracha, and through television, where five tuned trumpets playing Dixie turned a Dodge Charger into a character. Both are still among the most requested sounds going, and both are covered in the musical car horn guide. What took a roof full of trumpets in 1960 now loads onto a custom car horn as a plain MP3 file.

When the Horn Became Compulsory

Horns started out as an accessory you bought separately, the same way you might add a lamp or a mirror. As traffic grew, that stopped being good enough. Across Australia, the United States, the United Kingdom and most of the world, an audible warning device became required equipment on a registered vehicle, which is why every car you have ever owned came with one whether you wanted it or not.

That requirement is also why a second horn is an addition rather than a swap. A novelty car horn that runs alongside the factory one leaves the required device exactly where the manufacturer put it. What varies from country to country, and often from state to state, is when you are allowed to sound a horn at all, so the sensible move is a quick look at your own local road rules.

From One Sound to Any Sound

For a hundred years the story was the same: whatever your horn said when you bought the car, it said forever. Hutchison picked the ahooga. A factory engineer picked your beep. Nobody asked you.

That is the part that finally changed. A programmable car horn stores the sound as a file instead of a fixed mechanism, so the sound became yours to choose. The Sonic Horn holds four of them at once on a wireless remote, pushes 130 decibels through a 30W amplifier, and swaps sounds over USB in about two minutes. Load the klaxon ahooga as a nod to 1908, or load your own voice. The free sound clips library is a decent place to start.

It runs alongside your factory horn rather than replacing it, which keeps the warning device your car is legally required to carry exactly where it was. The remote is also why there is no wiring into the cabin, explained in the wireless car horn guide. That is the practical gap between a custom car horn you choose and a factory horn you inherit.

Common Questions

Who invented the car horn?

Miller Reese Hutchison, an American electrical engineer, patented the klaxon mechanism in 1908. Warning devices existed on vehicles before that, mostly bells and squeeze bulb horns, but Hutchison's klaxon is the ancestor of the electric car horn every modern vehicle carries.

What does the word klaxon mean?

It comes from the Ancient Greek verb klazo, "I shriek". Franklyn Hallett Lovell Jr. of the Lovell-McConnell Manufacturing Company coined the brand name, and it stuck so hard that people now use it for any loud warning horn.

Why do old cars go ahooga?

Because that is the sound a klaxon makes. A cogwheel strikes a rivet on a steel diaphragm dozens of times a second, producing a rasp rather than a tone. Modern horns vibrate a flat diaphragm electromagnetically instead, which is why they beep rather than shriek.

How loud is a normal car horn?

Traditional electric horns measure around 107 to 109 decibels, modern flat diaphragm horns around 109 to 112, and truck air horns around 117 to 118. For comparison, this novelty car horn runs at 130 decibels, which is among the loudest car horns you can fit without an air compressor and tank.

When did cars have to have a horn?

Not at the very beginning. Early cars carried whatever warning device the owner felt like fitting. As traffic grew, an audible warning device became mandatory equipment on registered vehicles in Australia, the United States and most other markets, which is why every modern car ships with one.

Can a car horn play music?

Composers have been doing it since the 1920s, and multi-trumpet horns playing La Cucaracha or Dixie have been on the road for decades. A custom car horn does it with a file instead of trumpets, so one unit covers every tune you want.

A century on, the brief has not really changed. Be heard, and be impossible to ignore. The genuinely new part is that a programmable car horn hands the choice of sound back to the driver.

Sources: the vehicle horn and klaxophone reference entries. Decibel figures are published typical ranges, not measurements taken by us.

Your Car..... Your Sound.