increased foreign investment, economic growth and EU funding, the city has undertaken the construction of new roads, flyovers and bridges. The supervising body is the City Roads Authority (ZDM – Zarząd Dróg Miejskich). Warsaw lacks a complete ring road system and most traffic goes directly through the city centre, leading to the eleventh highest level of congestion in Europe. The Warsaw ring road has been planned to consist of three express roads: S2 (south), S8 (north-west) and S17 (east). S8 and S2 are open. The A2 motorway opened in June 2012, stretches west from Warsaw and is a direct motorway connection with Łódź, Poznań and ultimately with Berlin. The city has two international airports: Warsaw Chopin Airport, located just from the city centre, and Warsaw-Modlin Airport, located to the north, opened in July 2012. With around 100 international and domestic flights a day and with 15,500,000 passengers served in 2017, Warsaw Frédéric Chopin Airport is by far the biggest airport in Poland and in Central-Eastern Europe. and it has also been called "the most important and largest airport in Central Europe". Public transport also extends to light rail Warszawska Kolej Dojazdowa line, urban railway Szybka Kolej Miejska, regional rail Koleje Mazowieckie (Mazovian Railways), and bicycle sharing systems (Veturilo). The buses, trams, urban railway and Metro are managed by Warszawski Transport Publiczny (WTP, Warsaw Public Transpoert). The regional rail and light rail is operated by Polish State Railways (PKP). There are also some suburban bus lines run by private operators. Bus service covers the entire city, with approximately 256 routes totalling above , and with some 1,700 vehicles. The first section of the Warsaw Metro was opened in 1995 initially with a total of 11 stations. As of 2020, it has 34 stations running a distance of approximately . The main railway station is Warszawa Centralna serving both domestic traffic to almost every major city in Poland, and international connections. There are also five other major railway stations and a number of smaller suburban stations. Culture Music and theatre Thanks to numerous musical venues, including the Teatr Wielki, the Polish National Opera, the Chamber Opera, the National Philharmonic Hall and the National Theatre, as well as the Roma and Buffo music theatres and the Congress Hall in the Palace of Culture and Science, Warsaw hosts many events and festivals. Among the events worth particular attention are: the International Frédéric Chopin Piano