Motorists using the A12 will be diverted through Witham on Tuesday and Wednesday nights.
The Witham bypass will be closed overnight for maintenance work, including road marking renewal.
The northbound road will be closed on Tuesday July 5, with the southbound route shut on Wednesday 6.
The bypass will be closed from 9pm until 5am between junctions 21 and 22 with traffic diverted through Witham via the B1389.
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