Motorists have been warned of changed traffic conditions on the northbound side of Captain Cook Bridge with work starting on a new noise wall.
Transport for NSW is constructing the 360 metre long, 4.5 metre high structure adjacent to Old Taren Point Road and up to Frederick Road.
Work will continue until December 18.
A Transport for NSW statement said work hours would be between 7am and 6pm from Monday to Friday, and during the night from 8pm to 5am from Sunday to Thursday, excluding public holidays and weather permitting.
Motorists using Taren Point Road will experience changed traffic conditions at times, with lane closures and a reduced speed limit of 40km/h.
The statement said building the wall required the removal of 51 trees, which would be replaced as part of the urban design plan for the project.
Miranda MP and Parliamentary Secretary for Transport and Roads Eleni Petinos said the project was "good news" for the local community, who often experienced very high traffic noise.
"The texture and colour of the noise wall fits in with the local landscape, is low maintenance and discourages graffiti and vandalism," she said.
The project is being delivered under the Noise Abatement Program.
Last year, a 150 metre long noise wall was built on the eastern side of Taren Point Road.