would continue to Pretoria and Cape Town. Except for passing through Ethiopia, the route roughly coincides with proposals for the Cape to Cairo Road put forward in the early 20th century British Empire. As noted above, TAH 1 and TAH 7 join to form an additional north–south route around the western extremity of the continent between Monrovia and Rabat. Regional highway projects in Africa Regional international communities are heavily involved in trans-African highway development and work in conjunction with the ADB and UNECA. For example: The Arab Maghreb Union drives the development and maintenance of the Tripoli to Nouakchott section of TAH 1. The Economic Community of West African States (ECOWAS) drives the development of and maintenance of TAH 5 and 7. the Southern African Development Community (SADC) has an extensive network of road projects and trade corridors in southern Africa. TAH 9 and the southern ends of TAH 3 and 4 utilize regional highways developed by SADC or its forerunners. In particular SADC manages road and rail corridors from landlocked areas to ports. See also Other intercontinental highway systems: SADC Regional Trunk Road Network, Asian Highway Network, International E-road network and Arab Mashreq International Road Network Trans-African Railway African transcontinental railroad Environmental impact of roads References African Development Bank/United Nations Economic Commission For Africa: "Review of the Implementation Status of the Trans African Highways and the Missing Links: Volume 2: Description of Corridors". 14 August 2003. Retrieved 14 July 2007. Further reading External links UN Africa Renewal article http://ttcanc.org