The construction of the second tube will take a total of ten years. The renovation of the existing tunnel will then take around another three years. From 2033, traffic will pass through both tunnels, with each tunnel having a single lane and its own hard shoulder.

• End of renovation work on the first Gotthard road tunnel
• Rennovation of the first tube
   

• System tests and commissioning of the entire system
• Opening of the second Gotthard road tunnel

• Operating and safety equipment

• Breakthrough for the main tunnel
• Construction of the second tube 

• Excavation with tunnel boring machines (TBM) from the north and south

• Start of the construction of the main tunnel
• Commencement of excavation using tunnel boring machines (TBM) for the northern and southern access tunnels

• Start of construction work for the re-routing of the service and infrastructure tunnel
• Start of construction work for the northern and southern access tunnel

• General start of construction work in Göschenen and Airolo