The eastbound carriageway will be closed each night between July 16 and 27. The work will be carried out between 9pm and 6am on Monday nights, 8pm and 6am Tuesday to Thursday nights, and 10pm and 8am Friday nights. Contingency closures may occur between 8pm and 9am on Saturday nights and 10pm and 5am on Sunday nights. The westbound carriageway will be closed from August 2 to 10. The work will be done overnight between 9pm and 6am weeknights and 10pm and 7am Friday nights. Contingency closures may occur between 8pm and 9am on Saturday nights and 9pm and 6am on Sunday nights. These times are when traffic flows are lowest, the Highways Agency says. Road users will be directed to follow a clearly signed diversion route via the A1 and A428. Local diversions will also be clearly signposted.