Transport for NSW (TfNSW) has advised maintenance work will take place on Kayuga Bridge near Muswellbrook from Tuesday, December 7.
The works, which include bridge maintenance and vegetation clearing, will cause changed traffic conditions and delays of up to 10 minutes according to TfNSW.
"Traffic control and a reduced speed limit of 40km/h will be in place for the safety of workers and motorists," TfNSW said.
"Motorists are advised to allow up to 10 minutes extra travel time, drive to the conditions, and follow the directions of signs and traffic control."
TfNSW said maintenance work will be carried out on the bridge from 7am to 3pm on weekdays and the work is expected to be completed by Thursday, December 23 subject to weather conditions.
TfNSW said motorists can receive the latest traffic updates by downloading the Live Traffic NSW App, visiting livetraffic.com or calling 132 701.