A variation of the image used in the SID Manuale, in the chapter on noise
Noise On
I've always had an interest in noise, and an issue with noise. I'm interested in noise's impact on people, why some people don't seem bothered by it, and why I am, and why is there is so much of it—NOISE—in the world. Past posts include: Noise and Nuisance; Bronzino to Babbage, A Field Guide to Italian Hotel Noises, and You Know It When You Hear It.)
So, it was with surprise and delight that I found a chapter in the Italian driving-license book on noise. In the SIDA Manuale della patente A e B (the Italian study book), noise is not treated as a vague annoyance, the thing you complain about while closing the window. It is classified properly, soberly, and a little optimistically as inquinamento acustico: acoustic pollution. Be still my beating heart!
This treatment of noise immediately elevates it. Now my crazy rantings on noise have backing. The truck with the loose load passing below the apartment at 6 am is no longer merely “that truck again.” It is part of Chapter 22.
The book places noise beside air pollution, fuel consumption, exhaust fumes, vehicle maintenance, and the broader civic duty of not degrading our shared environment. It is a high-minded little chapter and I like that. It imagines the driver as a careful, rational, socially aware person who maintains the vehicle, limits unnecessary acceleration, avoids useless honking, and remembers that the road is shared.
Book Noise
The Italian driving manual does not treat noise as a mere irritation. It calls it what it is: inquinamento acustico, acoustic pollution. Section 22.1.5 begins plainly and lists a few behaviors you see commonly when driving around Italy.
Here's the section of the book:
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Il rumore prodotto dai veicoli a motore è causa di inquinamento acustico e di una serie di problemi di salute. I rimorchi vuoti, che sobbalzano eccessivamente, possono essere causa di rumore. Per questo motivo, ogni conducente ha il dovere di osservare le seguenti cautele:
- far verificare che la marmitta (dispositivo silenziatore) funzioni bene e sia di tipo approvato, sostituire la marmitta rovinata con una approvata per il veicolo, senza manometterla o modificarla
- evitare inutili e ripetute accelerazioni a vuoto, da fermi
- far controllare i freni se stridono (sostituendoli se necessario) e cercare di non frenare bruscamente
- non precorrere le curve ad alta velocità e no provocare lo strisciamento degli pneumatici
- sistemare il carico ed eventuali coperture in modo idoneo
- curare la manutenzione della carrozzeria e delle sospensioni
- chiudere delicatamente la portiera (anche per non danneggiare l'autovettura)
- per avvisare in caso di emergenza, usare il lampeggio al posto del clacson
Bisogna usare il clacson con la massima moderazione e nei centri abitati solo in caso di effettivo e immediato pericolo. Quando è necessario, suonare il clacson il più brevemente possibile.
Causano inquinamento acustico:
- marmitta non omologata
- uso improprio del clacson
- brusche partenze
- brusche frenate
- freni che stridono
- brusche frenate in curva
- carico svolazzante
Some useful translations:
- inquinamento = pollution
- rimorchi = trailers
- sobbalzare = jump around
- marmitta = muffler
- clacson = horn
- freni = brakes
- carrozzeria = car body
- carico = load
- svolazzante = fluttering about
What I like about this list of causes of noise is how ordinary it is. The enemy is not only the roaring engine or the modified scooter exhaust. It is also the rattling trailer, the squealing brakes, the door slammed too hard, the horn used as punctuation, the fluttering tarp behind a truck. Noise is treated as a hundred small failures of attention. I guess you could say the entropy of noise in that everyone sort of says "Not my problem, I'm just driving down the road". This is similar to what we observed in the post Notes on Entropy from a Courtyard in Italy, which concluded that the concept of everyday entropy is the slow unraveling of order in one's surroundings because many say "not my job".
The manual is not saying: never make noise. Rather it says: do not make pointless noise. It is a tiny civic ethic disguised as test prep. Of course, I ace all the test questions in this section! They seem so obvious to me.
This careful driver exists. Somewhere maybe? Or, possibly only in the illustrations in the book.
Joking aside, studying for the Italian patente has changed how I hear the street. Before, vehicle noise fell mostly into emotional categories: irritating, very irritating, and mostly “is that thing legally allowed to exist?” Now I have a point of reference, a chapter in the official driver's manual. The bad muffler, the squealing brakes, the horn used as punctuation, the rattling load in the back of a truck: these are not just sounds. They are categories of noncompliance and sections that at least I can console myself with and point to even if it doesn't really help.
Clacson Dialects
The manual says the clacson should be used with la massima moderazione, and in towns only in cases of immediate and real danger. Good advice in theory, but in practice it's another story. (Also, "maximum moderation" sounds less like driving advice and more like a rule for surviving modern life.)
Moderate your horn, your speed, your acceleration, your impatience, and we'd add perhaps also your expectation that anyone else has read the same page. Why? Because, in practice, the horn has many unofficial meanings in Italy. It can mean:
“I am here.”
“You are slow.”
“The light turned green 0.4 seconds ago, step on it!”
“I know you, hi!”
“I am entering this blind corner and please be aware.”
“I am annoyed, and everyone within hearing range should be informed.”
So yes, officially, the horn is a safety device. Practically, the horn is a language. It has grammar, dialect, local idioms, and emotional range. It may be brief, extended, musical, accusatory, celebratory, or existential.
Clacson Meets Lden
While the Italian driving manual treats noise with admirable seriousness, as inquinamento acustico or acoustic pollution, there are no hard limits. The guidance seems squishy, basically "try not to make noise".
The European vocabulary around noise is more precise: Lden, Lnight, dB(A), exposure thresholds.
- Lden is the average noise over the whole day, evening, and night, with evening and night weighted more heavily because noise then is more disruptive.
- Lnight is the average night-time noise, especially relevant for sleep.
- dB(A) means decibels adjusted to approximate human hearing.
WHO Europe is more direct in its health-based recommendations. Its 2018 environmental noise guidelines recommend keeping road-traffic noise below 53 dB Lden and below 45 dB Lnight. Earlier WHO night-noise guidance gives 40 dB Lnight outside bedrooms as a target to protect the public, especially vulnerable groups. (Guidelines table.)
This is all somewhat useful to know, though perhaps less useful at the exact moment a 50cc (cubic centimeters) moto is ripping down Via Pignolo making the left turn onto Via San Tomaso. (Ironically, a 50cc moto can make upward of 80 dB(A) of noise.)
So figuring out whether Italy has “done something” under the Environmental Noise Directive turns out to be its own small research project. The EU directive requires maps and action plans, but the results do not live in one tidy place. Some are reported to the EEA (European Environment Agency), some appear through ISPRA (Istituto Superiore per la Protezione e la Ricerca Ambiente) indicators, and many live with regions, cities, airports, railways, and road operators. Italy has implemented the directive through D.Lgs. 194/2005 and has reported population exposure using Lden and Lnight. So yes, the maps and plans exist. Whether the street below your window has become quieter is, as usual, a different and more personal question. Maybe in a future post, we'll dig into these reports but for now, we'll have to accept that it's being thought about, seems to be measured, and maybe work is in progress to mitigate exposure. (Glancing quickly at the reports shows road noise as by far the largest contributor to noise exposure.)
In daily life terms, 50 to 55 dB(A) is not the apocalypse. It is roughly equivalent to a quiet street, a refrigerator hum, moderate rainfall, or the lower edge of conversation. These numbers are not about one spectacular noise event, or whether your ears are immediately damaged. They are about cumulative exposure: the acoustic climate you live in hour after hour, night after night. A loud burst, say a 50cc moto, a truck, or a horn, may pass quickly and add energy to the average. But, more importantly, it interrupts the body. It makes you pause, tense, wake slightly, or lose the thread of what you were doing. Environmental noise is often the background soup: tires, scooters, brakes, engines, deliveries, a horn here, a horn there, all simmering below the level of catastrophe but above the level of peace.
So where are we with noise? The manual gives noise a better name: acoustic pollution. The EU and WHO go further and give it numbers for measuring, even if the averages wash it all out.
European Driver, Quiet in Theory
The Italian book’s treatment of noise is not unique. Germany has an explicit Umweltschutz category in its theory-test material, where unnecessary acceleration is not just wasteful but noisy. France folds le bruit et la pollution into the theme of using the vehicle with respect for the environment.
The vocabulary changes, but the fantasy is shared: the driver as a calm, technically competent, socially aware participant in public space.
Naturally, we started to wonder if Italians are better, about the same, or worse in terms of noise pollution. How would you even measure this?
It turns out that comparisons are not that easily had. A 2022 study in Environment International looked at road-traffic noise exposure across 724 European cities and 25 larger urban areas, using Lden starting at 55 dB. It found that almost 60 million adults were exposed to road-traffic noise levels considered harmful to health. But the study also noted a very practical problem: the underlying noise maps varied in method, format, and quality. So the question 'Are Italians noisier?' quickly becomes 'What did France measure, what did Germany measure, and did Italy count that street with the delivery scooters?' Still, the broad picture is clear enough: road-traffic noise is a Europe-wide problem, and in many cities a large share of adults live above the 55 dB Lden threshold. (ScienceDirect)
The health connection in the ScienceDirect article is not that a honking car directly causes heart disease, satisfying though that explanation might be. Rather, traffic noise disturbs sleep, raises annoyance, and keeps the body making tiny stress adjustments: heart rate, blood pressure, hormones, vascular strain. Over years, those small insults can become less small. In that sense, inquinamento acustico is not only a poetic phrase from the driving manual. It is a public-health phrase hiding in plain sight.
The Italian and more generally the European driver, at least on paper, are custodians of the shared atmosphere: air, fuel, fumes, tires, brakes, and sound. It is a great idea in the manuals, but as we have noted, its application is where it kind of falls apart.
This is not to say that manuals are useless. Quite the opposite. They reveal the ideal. They show the shape of the civic person we are all supposed to become once we close the book, pass the exam, and enter a traffic circle with six exits, two motorcycles, a delivery van, and someone behind us expressing an opinion about our driving through the horn.
California Dreaming
After thinking about Italian drivers in relation to European drivers, we started to wonder about the United States. But the United States is not one driving system. Requirements and handbooks vary by state, even if the broad ideas are often similar. So, for a concrete example, we looked at California: not the largest state by area, since that honor goes decisively to Alaska, but the most populous state in the country, with more than 39 million people. Here's the California Driver Handbook.
California, being California, does have a section on “Green Driving,” with advice on smooth acceleration, steady speeds, tire pressure, vehicle maintenance, extra weight, and zero-emission vehicles. The environment is there, but mostly through the American vocabulary of efficiency, emissions, and technology.
The horn appears elsewhere, under safety. Use it to avoid collisions or warn others of hazards. Do not honk because someone is slow, because someone made a mistake, or because you are angry. The handbook even reminds drivers that the horn sounds much louder outside the vehicle, which is both obvious and apparently necessary to say.
What's interesting and laudable is that the Italian manual gathers these behaviors under a wider moral weather system: consumption, exhaust, maintenance, noise. The poorly maintained muffler, the unnecessary acceleration, the horn used as punctuation, the rattling load in the back: all are small failures of shared space.
The California handbook says: be safe, be efficient, don’t be a jerk. Gratuitous musical reference: "All the leaves are brown. And the horns are quiet..." sort of thing.
The Italian book says: you are part of an acoustic environment. Please behave accordingly. Gratuitous musical reference: "Prisencolinensinainciusol" sort of thing.
Exhaust as Personal Statement
The Italian driver's license manual also warns against modifying the vehicle, especially the muffler. This is where the theory becomes disconnected from reality, because some vehicles seem to treat the muffler not as a device for reducing noise, but as an instrument of self-expression.
The manual, being a manual, does not say any of this. It simply says the muffler should be approved, functioning, and not tampered with. It does not dwell on some drivers' desire to be heard before being seen.
After going through hundreds of quiz questions, I'm surprised how many questions come down to "is it okay to modify your muffler?". These muffler questions along with the noise questions are easy for me. Too bad the exam wasn't all of these types of questions.
There is something real hiding inside of rules, and that is that noise is rarely only mechanical. It is social, be it a horn or muffler. Noise says: I am here, I am impatient, I am powerful, I am careless, I am festive, I am young, I am late, I am delivering something, I am above maintenance schedules. But who could write rules and create exam questions for these meanings?
We could not find a neat statistic for how many Italians actually modify their mufflers. Perhaps this is just as well, because the phenomenon is easier to hear than to count. What we can say is that the issue is real enough to be written into the Codice della Strada. Article 155 says that drivers must avoid troublesome noise caused by how they drive, how the load is arranged, or other acts connected with circulation. It also says the silencing device, when required, must be kept efficient and must not be altered. So, the manual is not just being fussy. It is turning a legal principle into quiz form: the muffler is not a lifestyle accessory, even if some drivers seem to disagree.
Of course, aftermarket exhaust replacement is not automatically illegal. If it is approved for that vehicle and used as approved, it may be fine. The trouble begins when the exhaust becomes less “replacement part” and more “announcement system.” Somewhere between homologation and self-expression, the manual raises its hand and says: no.
Studying for the Exam, Clutching My Pearls
The book says:
- Not to accelerate unnecessarily. The, a car accelerates unnecessarily.
- The horn is for immediate danger. Someone honks because a pedestrian has the audacity to use a crosswalk.
- Avoid rattling loads. A truck passes with something loose and metallic performing percussion in the back. At 6am.
Maximum Moderation, Minimum Compliance
We are not always living in that world.
But there is something charming about the attempt. The manual names the problem. It gives us the polite version of civic life. It says: here is how not to add unnecessary noise to the world.
And that may be enough for a chapter in a driving book. Not enough to silence a modified scooter. Not enough to stop the celebratory honk, the impatient honk, the “I am behind you and therefore must communicate” honk. But enough to make you hear them differently and maybe even appreciate them.
I'll take that as a start. That's lesson one.
Once noise gets labeled as inquinamento acustico, we need to consider it as part of the shared air, like exhaust, dust, heat, and all the other things we contribute without quite meaning to.
The road is not only visual. It is not only signs, lanes, lights, and right-of-way. It is also sound. A public space has a soundtrack, and every driver is adding something to it. This is lesson two.
The Italian manual asks, with charming optimism, that we add less. Con la massima moderazione, of course.




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