Lowestoft's A12 Bascule bridge will be closed overnight on Monday for 'routine maintenance' work.
The work will take place from 8pm and is expected to be complete by 6am on Tuesday morning (June 7).
The bridge will be closed in both directions during the work and signed diversions will be in place.
National traffic travelling northbound will be diverted to the A1117 Bloodmoor Road, at the A12/A1117 Bloodmoor Road roundabout continuing on the A1117 (Bloodmoor Road, Elm Tree Road, Cotmer Road) to its junction with the A146 Bridge Road, turn left onto the A1117 Bridge Road, continue on the A1117 (Normanston Drive, Millennium Way, Bentley Drive) to re-join the A12 Yarmouth Road.
Southbound traffic will use the same routes in the opposite direction.
Local traffic travelling northbound will be diverted off the A12 London Road onto the A146 Pier Terrace continuing along Horn Hill, Waveney Drive and Victoria Road, turn right to join the A1117 and cross the bridge, continue to follow the A1117 Normanston Drive and St Peters Street to the roundabout with Katwijk Way, turn left to join the A12 Artillery Way at the next roundabout and vice versa for southbound traffic.
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