Noun1.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" divided highway highway,main road- a major road for any form of motor transport ...
Higher-speed roads require larger horizontal curvature to ensure that the centrifugal and centripetal forces prevent vehicles from abruptly exiting the carriageway when manoeuvring along a highway. The Department for Transport [6] indicated a speed limit of 70 mph for motorways and, in accordance ...