*"... how close should a person be entering the hallway from the opposite direct...

"... how close should a person be entering the hallway from the opposite direction be before I wave or say hello ..."

From far away, Joe Navarro, "Impressing other at a distance - getting it right" ~ http://www.psychologytoday.com/blog/spycatcher/201011/two-go... then up close, "Influence - Up Close (Part Two) ~ http://www.psychologytoday.com/blog/spycatcher/201102/influe...