Veidekke has signed a contract with the Norwegian Public Roads Administration to upgrade the Hammersborg and Vaterland tunnels on Ring 1 in Oslo. The project is a design and build collaboration contract and is worth NOK 2.1 billion excluding VAT. The Vaterland Tunnel (370 m) will be upgraded and the Hammersborg Tunnel (380 m) will also be rebuilt, extended, reinforced and lowered in the terrain as a result of security requirements for the new government buildings.

Both tunnels date from 1989, and extensive maintenance is needed, with repair of concrete structures and the roadway. General infrastructure such as lighting, cables, pipes, wires, signage etc. must also be replaced in both tunnels.