A bypass is an alternative route for traffic to travel through, usually a road. At the start of The Hitchhiker's Guide to the Galaxy, Arthur Dent's house is knocked down in order for a bypass to be built through the village of Cottington, where he lived. In an ironic twist, plans for a hyperspace bypass through the Milky Way cause the Earth to be destroyed by the Vogons.
Description in the Guide Edit
"Bypasses are devices that allow some people to dash from point A to point B very fast while other people dash from point B to point A very fast.
People living at point C, being a point directly in between, are often given to wonder what's so great about point A that so many people from point B are so keen to get there, and what's so great about point B that so many people from point A are so keen to get there. They often wish that people would just once and for all work out where the hell they wanted to be."