light rail are like much of the U6 listed building and are now partly used as a bike path. In 1991, the completely newly built line U3 between Erdberg and Volkstheater was opened, which crosses the first district after the U1 as a second line. The western terminus Ottakring was reached in 1998, the southeastern end of the U3 is since the year 2000 in the station Simmering. The total length of the network increased with these construction measures of the second stage to . Third expansion phase (2001–2010): The first extensions of U1 and U2 In 1996, a new U-Bahn contract, known as the "30 billion package", was settled. For the first time in Europe, a U-Bahn project had to undergo a costly and lengthy environmental impact assessment, as the U2 extension showed a length of more than ). This expansion phase involved: U1 extension to Leopoldau On 19 October 2001, the groundbreaking ceremony for the extension of U1 was held, for which the two districts had been waiting for 20 years. After five years of construction, the long extension of the U1 was opened on 2 September 2006. U2 extension from Schottenring to Stadium On 12 June 2003, the groundbreaking ceremony took place outside the Stadion (stadium). Because of the 2008 European Football Championships in Austria, there was enormous pressure to complete the construction on time. The Wiener Linien met the deadline, and on 10 May 2008 the U2 extension to the stadium was opened. U2 extension from Stadium to Aspern On 2 October 2010, a further six stations were opened taking the U2 across the Danube via Donaustadtbrücke to Aspernstraße in the twenty-second district (Donaustadt). An additional , three-station extension of the U2 to Aspern Seestadt was officially opened on 5 October 2013. Fourth expansion phase (since 2010): Further extension of the Vienna U-Bahn Planning for a fourth U-Bahn expansion phase began in 2001 and concrete ideas were put forth in the 2003 Transport Master Plan. In 2007, there are plans for the extensions in Vienna, this provided the necessary extensions: The extended U2 from Aspernstraße to Seestadt Aspern (then time horizon 2013) The extended U1 from Reumannplatz to Rothneusiedl (then time horizon 2015) The extended U2 from Karlsplatz to Gudrunstraße (then time horizon 2019) 2012 package In March 2012, it was officially announced that the southern branch of U1 would instead be extended to Oberlaa and