Aggressive drivers, who don't give the car in front of them enough space, and timid drivers, who need a big gap between themselves and the cars surrounding them, gum up the works for everybody else.

So now the gap between your friend on the right and left or the front to the back is exactly the same.

That's because employees — from a front-end cashier at Costco Wholesale to a GAP sales associate — are often a consumer's first and only interaction with a brand.