Synonyms of 'detour'
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A bypass is a main road which takes traffic around the edge of a town rather than through its centre.
A new bypass around the city is being built.
Thesaurus for detour from the Collins English Thesaurus
If you make a detour on a journey , you go by a route which is not the shortest way , because you want to avoid something such as a traffic jam , or because there is something you want to do on the way.