Which highway, numbered Trans-African Highway 4, connects Cairo, Egypt to Cape Town, South Africa?

The Cairo–Cape Town Highway is Trans-African Highway 4, linking Cairo in Egypt with Cape Town in South Africa.

The route is part of the continental Trans-African Highway network developed through cooperation involving the United Nations Economic Commission for Africa, the African Development Bank and the African Union. It is planned as a north–south corridor of roughly 10,228 kilometres.

Its modern alignment passes through or toward countries including Sudan, Ethiopia, Kenya, Tanzania, Zambia, Zimbabwe, Botswana and South Africa. In places, the corridor follows existing national roads; in others, links remain incomplete or difficult, so it is better understood as a connected transcontinental route than as one uninterrupted motorway.

The idea has older colonial roots in the proposed Cape to Cairo Road associated with British imperial ambitions and Cecil Rhodes. The modern Trans-African Highway is not identical to that historic concept: it uses some different routes, including an alignment through Addis Ababa rather than South Sudan.