Can the continent remove trade barriers and create a billion-person internal market? That's the hope of the African Continental Free Trade Area, but a year on from its initial signing, many obstacles remain.

Nearly all of Africa's 55 nations have signed up to the initiative, yet the most populous country Nigeria remains a hold-out. And there still remain huge logistical barriers to free trade, as Will Bain discovers when he speaks to frustrated truckers on the Zambia-Botswana border.

Ed Butler speaks to Ghana's minister for trade Alan Kyerematen, as well as Pearl Uzokwe of the African conglomerate Sahara Group, and Alex Vines of London-based think tank Chatham House.

(Picture: Trucks drive along the Ethiopian side of the Ethiopia-Eritrea border; Credit: Michael Tewelde/AFP/Getty Images)