Contractors will now work on the viaduct from Sunday June 26 through to Thursday June 30.
The work will be carried out at night between the hours of 7pm and 6am to avoid major delays to traffic.
One lane will be closed and speed restrictions will be in place. Motorists are urged to drive with extra care and attention through the site.
The Transport Agency apologises for any inconvenience caused and thanks motorists for their patience during the works.
For personalised information about driving conditions on their frequently used routes, motorists can check out and sign up to On The Move: www.onthemove.govt.nz
For real time information on highway conditions and incidents or to report issues on the network visit www.nzta.govt.nz and click on 'traffic and travel', call 0800 4 HIGHWAYS (0800 44 44 49) or follow the Transport Agency on Facebook or @nztawaibop on twitter.
People can also go to www.drivelivenz/BayofPlenty , a dedicated website that tells drivers what the current travel times are to get to key places around the Bay.