也不尽然吧

https://www.dmv.ca.gov/portal/file/california-driver-handbook-pdf/

Using Your Horn
You can use your vehicle’s horn to let other drivers know you are there
or to warn others of a hazard. It is important to know when to use
your horn, and when not to. It is safer to slow down or stop instead of
honking your horn.
Use your horn to:
? Avoid collisions (when necessary).
? Alert another driver of a hazard.
? Alert oncoming traffic on narrow mountain roads where you cannot
see at least 200 feet ahead of your vehicle.

我在很没有视线的一条道山路上鸣笛过

【 在 GeneralMilk (隐身) 的大作中提到: 】
: 美国没有过弯或者超车鸣笛的规矩，鸣笛只有一个意思就是我生气了
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