Define Long Bus Meaning

Long Bus
In the game of beer pong there are usually only a few types of racks. This is a rack no one seems to recognize as one. It is four cups in a row to make a long bus. It might also be called the extended stop light, like the one with the green arrow.

"We have four cups left, do you want to do the diamond?"
"No lets do the long bus."
By Brandea