That's what we're here for! What do you think this website is about?

However, having travelled extensively in what used to be called The Third World, I'd say the "non first-world" way of dealing with the issue of people stopping and blocking a thoroughfare is to honk your horn. Loudly and incessantly, at every opportunity.

And consequently nobody ever need look behind or around them, because you know that if you're in anyone's way, they'll let you know with a honk or twenty.

Perhaps at airports and malls, Horn OK Please signs could be handed out to the broad, the child-encumbered and the infirm.