transport in tanzania includes road, air, rail, and water networks. the road network is  long, of which  is classified as trunk road. the rail network consists of  of track. commuter rail service is in dar es salaam only. there are 28 airports, with julius nyerere international being the largest and the busiest. ==roads== thumb|one of the trunk roads   in 2007 there were  of roads, of which including  was paved. the road network ranked 51st worldwide by length."the world factbook: tanzania", united states central intelligence agency, 10 july 2013 ===trunk roads=== * dar es salaam and dodoma ( entirely paved):road distance chart - june 2012.pdf tanzania road distance chart, tanroads, june 2012 the a-7 road links dar es salaam and morogoro. the b-129 road then connects morogoro with dodoma. * dar es salaam and iringa ( entirely paved): the a-7 road links these cities. * dar es salaam and tanga ( entirely paved): the a-7 road links dar es salaam and chalinze. the a-14 road then connects chalinze with tanga. * dar es salaam and mtwara ( mostly paved): the b-2 road links these cities. it is paved from mtwara to lindi and somanga.lindi roads network, tanroads an unpaved road links somanga with ndundu to the north. the paving of this road is ongoing but has experienced many long delays."tanzania: ndundu-somanga road project delay saga explained", daily news, reprinted at allafrica.com, 17 may 2013 the remainder of the road to dar es salaam is paved. the long mkapa bridge is on this stretch of road, spanning the rufiji river. * tanga and arusha ( entirely paved): the a-14 road connects tanga and segera. from there, the b-2 road connects segera with the road's terminus at the himo junction. the a-23 road then leads west to moshi and arusha. * dodoma and mwanza on lake victoria ( (entirely paved): the b-129 road leads west to manyoni, followed by the b-141 road north to singida. from there, the b-3 road leads mostly west to nzega. the final stretch is on the b-6 road through shinyanga to mwanza.[h
Transport_in_Tanzania