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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
US and Canadian a road on which traffic travelling in opposite directions is separated by a central strip of turf, etcAlso called (in Britain and certain other countries): dual carriageway
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012