I never have understood the concept of four different companies selling the same product on the four corners of the same intersection. e.g. gas stations, burger joints.
For things like gas stations and burger joints it's capitalizing on traffic flow. It's easier to pull out of someplace on the far side of the intersection (defined by your travel path) than the near side. So what they're hoping is that you'll see the near gas station think "oh yeah I need gas" and then before you pull in notice the gas station on the other side and use them. Doesn't really work so well for bigger stores like OfficeMax though.