trunk road
From Longman Dictionary of Contemporary EnglishRelated topics: Roadstrunk roadˈtrunk road noun [countable] British EnglishTTR a main road used for travelling long distancesExamples from the Corpustrunk road• The school is situated half way between Maidstone and Ashford on the A20 trunk road.• By 1676 it was part of the main Oxford to Coventry road and of course remains as a major trunk road today.• Some 40 new ones will be opened by 1995 on trunk road alone.