Originally Posted by MinnMan

I agree that pointing gives more info than yelling "hole", but as already noted, not everybody sees the hand gesture and what the voice call does is get people to look down and ahead, when they might not otherwise be at that moment. Don't tell me that in a good group everybody has all of their attention on the road in front of them 100% of the time. That's not true.

Also, the reaction time is slower for a hand gesture than for vocalizing.

And as already noted, the hand gesture isn't that effective in big groups.

The two are not mutually exclusive and as I said earlier, you do what you can do.