The right turns from both the northbound and southbound lanes on Goderich Street into Lindsay Street were removed, as were the turns from Esplanade into Charles Street and from Charles Street into the Esplanade.

The turns were removed temporarily to test whether it would relieve congestion and queuing on the Charles Street Bridge and Goderich Street, while also minimising traffic impact on surrounding roads.

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Infrastructure and Transport Minister Michael Ferguson said a survey of road users found 58 per cent of the 1000 submissions received noted reduced congestion during the three-month trial.

"Traffic data collected during the trial has now been analysed and shows significant improvements to journey time of up to a minute for northbound traffic and minor improvements for southbound traffic on Goderich Street," he said.

"The changes did not result in significant traffic impacts on the surrounding roads, although there were minor increases in journey time on Lindsay Street of around 8.3 seconds on average for eastbound travel and around 5.2 seconds for westbound travel."

The state government partnered with the City of Launceston in 2020 under the Invermay Traffic Masterplan to make traffic flow improvements to the suburb.

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As part of the changes, an additional right turn lane from Goderich Street into Forster Street was added to keep traffic flowing.

"At least double the number of vehicles are now able to turn right or effect a U-turn during a green arrow signal as a result of this measure," Mr Ferguson said.

"We also created a new exit from the big-box zone and a new, controlled intersection on Gleadow Street which will continue to take pressure off Lindsay Street as motorists become more familiar with this more reliable exit route."

A new link road between Gleadow Street and Lindsay Street was also completed to improve accessibility, and is expected to address the increased travel time on Lindsay Street.

Design of the new intersection arrangements is underway and work is expected to start in 2022.