Hungária körgyűrű (lit. Hungary beltway or Hungary boulevard) is the longest and busiest boulevard, also the widest city street in Budapest, Hungary. It's 13 km long and has 6-10 traffic lanes with a rapid tram line on the median of the boulevard. It consists of three parts: Róbert Károly körút, Hungária körút and Könyves Kálmán körút.