Dual carriageway

Clara Barton Parkway outside Washington, D.C.

A dual carriageway (North American English: divided highway) is a class of highway with carriageways for traffic travelling in opposite directions separated by a central reservation (North American English: median). Roads with two or more carriageways which are designed to higher standards with controlled access are generally classed as motorways, freeways, etc., rather than dual carriageways.

单词	Dual highway
释义	Dual highway 英语百科 Dual carriageway A dual carriageway (North American English: divided highway) is a class of highway with carriageways for traffic travelling in opposite directions separated by a central reservation (North American English: median). Roads with two or more carriageways which are designed to higher standards with controlled access are generally classed as motorways, freeways, etc., rather than dual carriageways.
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Dual highway

Dual carriageway