President Mahama cut the sod for the construction of the three-tier interchange at the Kwame Nkrumah Circle in October 2013.
According to Chief Resident Engineer Kweku Attakow Diafo, the extension is due to the impasse between traders, whose property were to be demolished, and the project engineers at the site.
“The footprints of some of the roads go through that section and if I have a programme to work in that zone to clear that work and you don’t allow me, it means that all my workers will have to be assigned somewhere,” Mr Diafo told Accra-based TV3.
He added that the deadline extension will not affect the cost of the project.
Drivers who operated at the Kaneshie-Odorkor Lorry Station and the Odorna Lorry Station were subsequently relocated temporarily to areas along the railway line to make way for the construction.
The project is being funded with a loan from the Brazilian government and being executed by Queiroz Galvao, a Brazilian company.
Other parts of the project include the replacement of the statue of Ghana’s first President, Osagyefo Dr Kwame Nkrumah, with a new one, the construction of a fountain, a police post and a new lorry park.
The project, when completed, will ease traffic congestion and reduce travel time for commuters.