At the interchange near Palmanova, the A4 branches off to Autostrada A23 linking to Austria's Süd Autobahn (A2) via Udine and Tarvisio. In the southern direction, this highway also offers seamless interconnection to Slovenia's A1 Motorway, and through that to highway networks in Croatia, Hungary, and the Balkans. Local public transport is operated by Trieste Trasporti, which operates a network of around 60 bus routes and two boat services. They also operate the Opicina Tramway, a hybrid between a tramway and funicular railway, providing a more direct link between the city centre and Opicina. However, this tram network has been out of service for at least a year. Works on reopening the line, however, are said to be starting in the near future. The average amount of time people spend commuting with public transit in Trieste e Gorizia, for example to and from work, on a weekday is 49 min. 10% of public transit riders, ride for more than 2 hours every day. The average amount of time people wait at a stop or station for public transit is 11 min, while 18% of riders wait for over 20 minutes on average every day. The average distance people usually ride in a single trip with public transit is 4.6 km, while 6% travel for over 12 km in a single direction. Trieste hosts the Secretariat of the Central European Initiative, an intergovernmental organization among Central and South-Eastern European states. In recent years, Trieste was chosen to host a number of high level bilateral and multilateral meetings such as: the Western Balkans Summit in 2017; the Italo-Russian Bilateral Summit in 2013 (Letta-Putin) and the Italo-German Bilateral Summit in 2008 (Berlusconi-Merkel); the G8 meetings of Foreign Affairs and Environment Ministers respectively in 2009 and 2001. In July 2017, Trieste was selected by Euroscience as the European Science Capital for 2020. Trieste is twinned with: