Ghetto Buffer

The area of ghetto and bad neighborhoods that separates a major city from the surrounding suburbs. To get to downtown, one must either go through, or around the Ghetto Buffer.

Wife: Honey, why are you getting on the freeway? It's a shorter trip on the smaller roads because of all the traffic on the interstate.
Husband: I'm not driving this car through those shitty neighborhoods. We have to avoid the Ghetto Buffer.