Metro Line M4 (Budapest Metro) Metro Line M4 (Budapest Metro) Line 4 (officially: South Buda–Rákospalota (DBR) Line, Metro 4 or M4, and unofficially: Green Line), is the fourth line of the Budapest Metro. It opened on 28 March 2014. The first section, 7.4 km in length and consisting of ten stations, connects the southwestern Kelenföld vasútállomás located in Buda, and the eastern Keleti pályaudvar in Pest, under the River Danube. While three additional sections — one an eastern extension to Bosnyák tér, the second west to Virágpiac, and a third further east to Újpalota — have been planned, these remain unfunded by the Budapest city
Budapest procurer duties, managing public service contracts, operating controlling and monitoring systems, setting and monitoring service level agreements related to public transport, attending to customer service duties, selling and monitoring tickets and passes, attending to integrated passenger information duties, unified Budapest-centric traffic control within public transport, attending to duties related to river navigation, plus the management of Budapest roads, operating taxi stations, unified control of bicycle traffic development in the capital, preparing parking strategy and developing an operational concept, preparation of road traffic management, developing an optimal traffic management system, organising and co-ordinating road reconstruction and more, in short, everything which