They will sit on seven private properties as part of a programme to better understand road noise before the four-laning project is finished by 2013.
It follows calls for more data to be collected before contractors start the Andersons Bay Rd to Barnes Dr leg of the two-stage, up-to-$49 million Caversham highway improvement project.
South Rd resident Sarah Campbell-McKenzie said she hoped the stations would give a clear idea of noise, which some worried would get worse when the first stage of the highway project was finished.
"We get the noise now, and the plan will bring the road and the noise closer to properties," Ms Campbell-McKenzie said.
"So we think it is important to get a very good idea of what the noise issue is, and for [the New Zealand Transport Agency] to use it to address our concerns."
Opus International project management consultant Tim Browne said residents did not think one monitoring station, at Bridge St, was enough to get an accurate noise-contour model.
The "snapshot" data collected this week would help further monitoring when the section was finished, Mr Browne said.
In a letter sent to residents last week, the New Zealand Transport Agency (NZTA) said there were no noise limits for existing roads and highways, including the current highway and the wider designation, but that there were limits for new and altered roads.
It said traffic would be about the same as now but would flow more freely at peak times, so there should be no significant increase in noise and levels should meet the preferred limit of 64 dBA.
Low-noise road surfacing and concrete safety barriers could even reduce noise, compared with current levels.
NZTA acting regional state highways manager Murray Clarke said some residents were also worried construction would affect the stability of Clyde Hill.
Apart from excavating the relocated walkway and levelling the ground between the existing highway and the rail line, work on the new highway largely avoided excavation into Clyde Hill, he said.
The work would strengthen the base of the hill, while the Barnes Dr-McCracken St pedestrian bridge's foundations would be bored in, to avoid vibration.
Stability monitoring stations will be installed and property owners would also be offered a photographic survey of their properties.
