President Mahama opens Nkrumah interchange at Circle in Accra (PHOTOS) President John Dramani Mahama on Monday, November 14, 2016, opened the Kwame Nkrumah interchange to ease traffic at the Circle. The 74.88 million euro project was jointly financed with credit from the Brazilian Government and the Ghana Government. The Flyover, was constructed by a Brazillian Company Queiroz Galvão. “This is the longest flyover and the highest in West Africa...please note I said flyover, the longest bridge is in Lagos, Nigeria but the longest and highest flyover is in Accra, Ghana. “ President Mahama