Originally Posted by
idoru2005
The problem with using your voice like a horn is that it's usually too late at that point - it is used reactively.. What I was talking about (ie, using my hand as a stop sign) is proactive. I don't wait until it's too late. I get eye-contact and I make the sign almost immediately. It gets the message across before they've had time to decide they would continue to move.
It depends on how you use your voice; I've stopped cars in their tracks with mine.