Traffic on avenue Princesse Grace will revert to two directions from Friday, July 7, where a one-way system has been operating to the right of the building work on Testimonio II.
At the same time, the construction of a temporary bridge will make it possible to maintain the two lanes of traffic on the boulevard du Larvotto West.
Operation Testimonio II is due to be finished by 2021, and will accommodate the International School of Monaco, with 700 pupils, a crèche for 50 youngsters, 150 public housing units and private housing.
There will also be a landscaped public space and a public car park with 800 spaces. Public elevators will serve avenue Princesse Grace and boulevards Larvotto and Italy.