The temporary Buckle St diversion is now open and motorists are once again able to access the road from the top of Tory St.
The top of Tory St was turned into a cul-de-sac late last month while construction on the Buckle St diversion road was undertaken.
The diversion will be in place until the new underpass is completed next year. Until then drivers will have to use the Basin Reserve roundabout and Rugby St to access Tasman St.
There is also a new signalised pedestrian crossing at the intersection of Buckle and Sussex streets.
The crossing is part of a new pedestrian and cycle route between Tasman and Tory streets.
Access to Massey University and the National War Memorial will be from the city-end of Tasman Street.
NZ Transport Agency Wellington State Highway Manager Rod James says the roading changes will be in place until the new underpass is completed in late next year.
"Heavy machinery will be on site from mid- February and trenching starts in early March.
"We thank the public for their patience while they get used to this new road layout as we work towards the development of the Memorial Park underpass."
- The Wellingtonian