单选题 · 选择一个答案
When is using your vehicle horn appropriate?
以下哪种情况适合使用车辆喇叭？
Use your horn for reasonable traffic warnings, not anger, greetings or frightening horses.
喇叭只能作为合理交通警告，不能用来斗气、打招呼或惊吓马匹。
阅读相关知识
A genuine traffic danger need not involve poor visibility, but the warning must not create unnecessary or excessive noise.
是否需要鸣笛取决于实际交通危险，不限于视线不佳；警告也应适度，不能制造不必要或过大噪声。