There will be traffic lights installed on the Hayle bypass overnight from 7.30pm to 4am from May 19 to 23.
The Highways Agency says that this is so surveys can be carried out.
The A30 Temple Bridge, east of Bodmin will see the westbound lane closed overnight from May 19 to 23 for resurfacing work.
The overnight convoy will beworking between 7pm and 5am.
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