1960s onwards intensive housing development took place, consisting mainly of pre-fabricated concrete blocks of flats. The largest areas of such development were Rataje and Winogrady. Later Piątkowo, which came within the city boundaries in 1974, would be used for similar large-scale building. A major infrastructural change in the city centre, completed in the late 1960s, was the rerouting of the river Warta so that its main stream flowed in the former relief channel east of Chwaliszewo (as had been planned following the floods of 1889); a right branch was also created linking with the Cybina across the former Berdychowo dam (Tama Berdychowska), thus making Ostrów Tumski a true island between the two branches. The former main stream west of Chwaliszewo was filled in and the land reclaimed, and a new main road was built crossing the island, with bridges across both river branches, leading to Śródka (where significant demolition took place south of the main square). In the administrative reforms of 1975, Poznań ceased to be a city with separate voivodeship status, and became the capital of a much smaller Poznań Voivodeship. Following the early successes of the Solidarity movement, in 1981 a monument to the events and victims of June 1956 was erected on Adam Mickiewicz Square, with Lech Wałęsa attending. In 1983 Pope John Paul II visited Poznań. In 1987 the most recent expansion of the city's boundaries took place, with the addition of new areas mainly to the north, including Morasko, Radojewo and Kiekrz. Following the fall of communism, the first free local government elections took place in 1990. A second papal visit took place in 1997. In 1998 a Weimar triangle meeting took place in Poznań between German chancellor Helmut Kohl, French president Jacques Chirac and Polish president Aleksander Kwaśniewski. In 1997 transport communication between the northern estates of Winogrady and Piątkowo and the city centre was greatly improved with the opening of the Poznań fast tram route (Poznański Szybki Tramwaj, popularly Pestka). Poznań gained its first motorway connection in 2003 (part of the A2 autostrada running south of the city in the directions of Warsaw and Berlin). With the Polish local government reforms of 1999, Poznań again became the capital of a larger voivodeship, now called Greater Poland Voivodeship. It also became the seat of a powiat ("Poznań County"), although the city itself acquired separate powiat status. In 2006 Poland's first F-16 Fighting Falcons arrived