TRAFFIC diversions near the Tailrace at Riverside are expected to be in place for about two weeks.
A Department of Infrastructure, Energy and Resources spokeswoman said work on the landslip was progressing well and would be completed as soon as possible.
The works have resulted in south-bound traffic being diverted into a single north- bound lane.
"At this stage, the current temporary traffic management arrangements will be in place for around two weeks and we ask motorists to slow down, obey all detour signs and any directions from traffic controllers," the spokeswoman said.
West Tamar Mayor Barry Easther said the council had not received complaints from the community, but noted that traffic moved slowly at peak hours.
Cr Tim Woinarski said the delays strengthened the need for a new bridge over the Tamar River.
"The current disruption experienced by motorists as a result of the roadworks at the Tailrace not only highlight the fragility of some sections of the northern road network, but also emphasises the strange situation that for many West Tamar residents south of Exeter there is only one major road access to the CBD," he said.
Cr Woinarski said a bridge spanning from Windsor Park to the East Tamar highway would alleviate traffic issues and provide an alternative route to Launceston's CBD.