The detour, along Gladfield Rd and Gladstone Rd South, has been in place since February 7 as work is undertaken in the Dunedin-bound lane of Main South Rd (State Highway 1).
A Waka Kotahi New Zealand Transport Agency spokeswoman said roads were designed to cope with the normally expected volumes and types of traffic for the particular route.
Gladstone Rd had some pre-existing and emerging defects, but they had deteriorated at a quicker rate than would ordinarily be expected — in part because of higher traffic volumes and heavier traffic using the detour.
"Waka Kotahi and the Dunedin City Council will work together to assess any new defects that have emerged on notified detour route," the spokeswoman said.
Where appropriate, they would agree on repair resolutions.
A large pothole in Gladstone Rd South, near the intersection with Gladfield Rd, had been repaired with asphalt on Saturday.
The roadworks on State Highway 1 were on track to be completed by Tuesday as intended, the spokeswoman said.
Mosgiel-Taieri Community Board chairman Andrew Simms said a "significant amount of degradation"had happened to the roads on the detour route.
While the worst of the potholes had been repaired, the board was keen to see the condition of the roads restored when the detour was finished.
"If there is further remedial work needed at the end of the road, we’ll certainly be pushing for that to be done straightaway,"Mr Simms said.
Getting heavy transport routed through Outram, after a pothole on Gladfield Rd appeared, had probably been a win for the community, he said.
Since then some significant potholes had appeared in Gladstone Rd, although they had been addressed promptly.
Waka Kotahi had attended the last board meeting and been asked directly about repairs.
The board was told a video was taken to check the road condition before the bypass went ahead, Mr Simms said.
"There’s been an assurance given that will be done, and we’ve got no reason to doubt that,"he said.
Traffic congestion on the detour had improved since it was first put in place, largely because Mosgiel commuters had been organising their own workarounds, Mr Simms said.
