Motorists are being advised of traffic changes to Cabbage Tree Road for three weeks starting on June 1 while a section of the Williamtown thoroughfare undergoes "essential maintenance" work.
Port Stephens Council will carry out the state government-funded work which will see a 600 metre section of the road between Barrie Close and Nelson Bay Road rebuilt.
Parliamentary Secretary for the Hunter Catherine Cusack said the work is part of the NSW Government's $400,000 investment in providing "stronger, longer lasting and safer road for all road users".
"Cabbage Tree Road is an important link to the Newcastle Airport and RAAF Base at Williamtown, so it is great to see this road improvement taking place which will support jobs and local businesses during this challenging time," Ms Cusack said.
Work to establish a work site compound will start from Wednesday, May 27 with the major road work expected to start on Monday, June 1.
Work will be carried out between 7am and 6pm from Monday to Saturday.
It is expected to be completed in three weeks, weather permitting.
Detours for westbound motorists will be in place 24 hours a day from June 1 to June 15.
Westbound motorists will be detoured via Richardson Road towards Raymond Terrace or via Nelson Bay Road towards Newcastle.
Motorists who wish to use Cabbage Tree Road during the three week road works period are being advised to plan ahead as the detour is expected to add up to 25 kilometres or 20 minutes travel time to their journeys.
Access through the roadworks will be maintained for residents and emergency services.
The road will temporarily reopen for two-way traffic on Sunday, June 7 and Monday, June 8, during the long weekend.
Work requiring a road re-closure to westbound traffic will resume on Tuesday, June 9.
Lane closures, a reduced speed limit and a stop/slow traffic arrangement will be in place during work hours from Tuesday, June 16 for one week.