divided highway

noun
a superhighway with a broad median strip, designed to prevent collisions, headlight glare, etc., between vehicles moving in opposite directions, and usually having limited or cloverleaf access.
Also called dual highway.
Compare autobahn.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
divided highway
 
n
(US), (Canadian) Also called (in Britain and certain other countries): dual carriageway a road on which traffic travelling in opposite directions is separated by a central strip of turf, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The aging roadway will be redesigned as a four-lane divided highway to improve capacity and safety.
Widening the road into a four-lane divided highway will reduce congestion and the likelihood of collisions.
When installed on both sides of a divided highway, one side is the primary installation.
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