Definition of trunk road noun from the Oxford Advanced Learner's Dictionary

 

trunk road

 noun
noun
BrE
 
; NAmE
 
(British English) Types of road
 
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an important main road See related entries: Types of roadExtra examples Over a 1 000 miles of new trunk roads and motorways have been built. The M40 motorway and the A34 trunk road make the town easily accessible. They are spending over £200 million on improvements to the Edinburgh trunk road system.