Motorists travelling near Wanaka may experience delays as road works are undertaken on the Luggate Red Bridge from Monday, 6 May.
The one lane bridge on State Highway 8A will undergo significant strengthening and safety work for the next six weeks.
The bridge will be closed to all traffic from 9am to 7pm on weekdays with a detour in place.
Motorists will need to travel through Hawea Flat and Albert Town via Camphill Road and Kane Road as well as along state highways 8A and 6 for the detour.
New Zealand Transport Agency maintenance contract manager Mark Stewart said people's usual journeys would be affected.
"We acknowledge this will be inconvenient and we recommend that road users plan ahead, travel after 7pm or before 9am on weekdays or use the alternative route," Mr Stewart said.
The bridge will be open overnight and every weekend.
Multi-million dollar underpass
Alson in Central Otago, a new multi-million dollar underpass, is being opened to improve road safety in Queenstown.
The intersection project aims to create a safety underpass for motorists and cyclists travelling on Tucker Beach Road.
Presently, traffic on that road has to turn across two busy lanes of highway traffic to travel toward Frankton.
The underpass will enable motorists to travel under the Shotover River Bridge before connecting to a new 500m slip lane on State Highway 6.
The $6.4 million project will be opened tomorrow morning.