The 10 and 5 rule of body language and greeting behavior

How can body language change a business.
For years in my programs I have talked about greeting behavior and it's impact on first impressions.
In the Atlanta paper Sunday there was an article on customer service that mentioned a business that applies one of my greeting principals.
The Georgia World Congress Center, the fourth largest convention center in the country is working to improve it's customer service with specific directives. One of those directives they call the "10 and 5 foot rule." Workers are trained to make eye contact with a customer at 10 feel and acknowledge the person at 5 feet. How does this help. Well typically when we are walking and meet someone we make eye contact at 15 feet and do an eyebrow flash to show we are not going to harm them then if we are going to interact we stop at about 4 feet to greet (that's handshake distance) and shake hands. I suggest in customer service situations and sales situations that you actually smile and make eye contact and reach out your hand earlier at about 5 feet to let the other person know you want to stop to interact. In sales situations it always increases your chances of getting a good handshake in situations where prospects may try to avoid that contact. So the Congress Center knows that that the greeting can make strangers in their huge monilith building feell safer in the space by giving a extra freindly greeting. Yep, they have that body language thing down.