And, amazingly enough, there are actually laws that require their use! So, in addition to being a good way of letting other motorists know that you’re mentally engaged in the act of driving, letting them know that there’s a reason you’re suddenly slowing down, driving out of your lane or have a hot a clue what you plan to do at that intersection, it’s actually a legally mandated practice!
Of course, unless laws are enforced they’re more or less weak suggestions that only come into play after you’ve done something stupid and caused harm to someone else.
Sorry, it’s just one of my pet peeves, right up there with motorists who are so engrossed in their smart phones & texting that they fail to react to stoplights turning green and then pull their heads out of that dark place just in time to blast through the yellow light while stranding the other motorists behind them as the lights quickly cycle back to red. Yeah, I’m that guy who nails the horn 2 seconds after a light turns green and a car ahead of me doesn’t react; no, I’m not from the south. I understand that a car horn has a purpose beyond happy taps to say goodbye or to blow at cyclists who are minding their own business and legally using the roads.
End of my rant.