the municipality responsible for construction. The city would pay NOK 224 million, while the state would pay NOK 673 million. The first section opened from Ullevål stadion via Nydalen to Storo on 20 August 2003, costing NOK 590 million. With the opening, line 4 was extended from Ullevål stadion to Storo. Nydalen had grown up as an urban redevelopment area after the local industry had been abandoned in the 1980s, where 14,800 jobs had been located by 2004. On 20 August 2006, the final section opened, from Storo via Sinsen to Carl Berners plass, with the whole project costing NOK 1,348 million. A report published by the city in 2007 declared the line a success and stated that all goals for the line had been exceeded. A survey conducted by the city in 2003 and 2007 showed that the Ring Line had a significant impact on the use of public transport in the area. Total public transport usage increased from 28 to 45%; use for commuting increased from 35 to 61%. At the Norwegian School of Management (BI), 85% of the students used public transport. The Ring Line reduced the estimated number of daily car trips by 10,000, and generated 11,000 more daily public transport trips. In 2007, daily passenger numbers at the stations were 8420 for Nydalen, 3630 for Storo and 2300 at Sinsen. The line allowed travel time from the Nydalen and Storo to the city centre to be halved, and travel time from Nydalen to the city center is faster by metro than by taxi. Route The Ring Line branches off from the Sognsvann Line after Ullevål stadion, just before Berg. It immediately enters a tunnel that runs via Nydalen to Storo. The station at Storo is just outside the entrance to the tunnel. From Storo to Sinsen, the tracks are laid parallel to the Gjøvik Line of the mainland railway. Also the Sinsen Line of the Oslo Tramway and the Ring 3 motorway follow the same corridor between the two stations. The section between Ullevål stadion and Storo is , while the section from Storo to Carl Berners plass is . Of these, are in tunnels. The Nydalen district, formerly an industrial area, has since undergone urban redevelopment. The immediate vicinity of the station includes several large workplaces. In 2005, BI, with 8000 students and faculty, moved into a new campus across the street from Nydalen