Highways Agency project manager, Geoff Chatfield, said:
Work on the A11 dualling and improvement scheme is progressing well and now reaching its final phase.
Road users and local residents have already seen immediate benefits of reduced congestion and smoother journeys thanks to the opening of the bypass at Elveden in April. Opening of the B1112 underpass is another key milestone bringing us another step closer to delivering smoother, faster journeys along and around the A11 in Suffolk.
As always, we are working closely with local partners to ensure disruption to road users is kept to a minimum while we continue to work on this important project.
Subject to satisfactory weather conditions, work to open the underpass is expected to start overnight on Friday 17 October and complete by 6am on Saturday 18 October.
The new B1112 underpass replaces the previous staggered junction with the A11 which was difficult to use and had a poor accident record. Traffic will be able to travel between the A1065 at Eriswell and the A1101 at Icklingham directly, using the new route under the A11.
The current temporary 40mph speed restriction on B1112 will be lifted but there will be no access onto or off the A11 from the B1112. Local traffic wishing to access the A11 can use the nearby Fiveways junction at Barton Mills as they do now.
Work on the A11 Fiveways to Thetford dualling and improvement scheme is due to complete in the winter.
For more information about the scheme and to register for regular updates, visit the project page. Road users can also call the Highways Agency Information Line on 0300 123 5000 or follow @HAtraffic_east on Twitter for the latest travel information.
Members of the public should contact the Highways Agency Information Line on 0300 123 5000.
Journalists should contact the Highways Agency press office on 0844 693 1448 and use the menu to speak to the most appropriate press officer.