I grew up in Colorado and I was always taught to beep the horn just before every blind corner on those one lane or barely two lane roads that wind through the m

I grew up in Colorado and I was always taught to beep the horn just before every blind corner on those one lane or barely two lane roads that wind through the mountain. I still do this now that we live in SF. Anytime I'm on my bike and come across a blind corner I whistle loudly, it's saved me a few times.