Any city/metro bus that there are only a few riders on.
(Years ago, Milwaukee buses used to be a "baby-poop" green, so we always called them the green limousine, the current ones are predominately a darker green) Generally, the actual color of the bus does not matter because all buses are "Green", ie; eco-stuff.
Dude, you work downtown, do you take your car?
No, parking is too expensive, so I take the green limousine.
older slang term used to describe Chicago buses which is derived from there formerly green color. The term has been used less frequently because most Chicago buses are now mostly blue and white.
A: How are you gettin' to work now that Sheila wrecked your car?
B: I guess I will be taking the green limousine.