divided highway,
dual carriageway a highway divided down the middle by a barrier that separates traffic going in different directions; "in Britain they call a divided highway a dual carriageway"
A highway is a public road, especially a major road connecting two or more destinations. Any interconnected set of highways can be variously referred to as a "highway system", a "highway network", or a "highway transportation system". Each country has its own national highway system.
OmegaWiki Dictionary
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highway A public road especially an important road that joins cities or towns together.
highway A wide road built for fast moving traffic travelling long distances, with a limited number of points at which drivers can enter and leave it.