3. Honk your horn
Honk your horn when you are approaching a blind curve to warn others that cannot see you coming.
More from web:
People on the other side of the curve turn can't see anything you're doing, which means they won't see you put your car in the middle of the line, they can't see your turn signal or your brake lights because it's a blind turn.
So, the only way to get their attention is to blow your horn