noun A main public road, especially a multi-lane, high-speed thoroughfare.
noun Any public road.
noun A way; a path that leads to a certain destiny.
You're on a highway to greatness.
noun A road that is major (more heavily traveled and thus more important than a byway), higher than the surrounding land, has drainage ditches at the sides, or has any combination of those traits.
noun Synonym of bus (“common connection for two or more circuits or components”).