smart motorway
noun/ˌsmɑːt ˈməʊtəweɪ/
/ˌsmɑːrt ˈməʊtərweɪ/
(British English) (North American English smart highway)
- part of a motorway (= a wide, fast road) in which the speed limit is varied and lanes (= sections of the road with traffic moving along in the same direction) are opened and closed depending on how much traffic there is
- There was nowhere to stop as they were on a smart motorway and all lanes were being used.
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smart motorway