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Not really.
Here emergency vehicles only put their sirens on for a few seconds when they're stuck behind some oblivious idiot who hasn't seen them coming and pulled over.
How's are rarely used to alert you to something you need to be aware of.
Even so, noise cancelling headphones suck at blocking that type of sound. It mitigates ongoing noises like engine sound, but not something with changing pitch like a horn or siren.
Horns are ABSOLUTELY used to alert you to something you need to be aware and prevent accidents all the time. Just because assholes like to misuse them doesn't change the reasoning on why they are required on all vehicles.
Sirens are specifically useful when you are around a blind corner and an emergency vehicle is coming toward you. Or when you otherwise don't have line of sight with the stoving lights.
Earplugs don't descriminate they just dull your senses. Noise canceling headphones are to a lesser extent a handicap.
I've been driving for 25 years.
I honestly can't remember a time when a horn has alerted me to something I needed to be aware of.
Sirens here definitely aren't used in that way. Besides which you can see the stroving lights reflecting off things. You don't need line of sight.
If headphones were such an impediment to safe driving they would be illegal. They're not.
They are in some jurisdictions.
Amazing.