Kennedy Gondwe BBC News, Lusaka
The construction of the Kazungula Bridge, which connects Zambia and Botswana across the Zambezi river, has been completed and is ready for use.
The $259m (£200m) structure, which was built jointly by the two countries, was started in 2014.
The road and rail bridge will speed up the movement of goods and people within the Southern African Development Community (Sadc) region.
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Zambia’s Minister Infrastructure Vincent Mwale said the bridge will cut travel time from days to hours.
“We are excited that this state-of-the-art bridge has been completed and I have been told that this facility will reduce the transit time for heavy duty vehicles between Zambia and Botswana from more than three days to only two hours.
“This is a great milestone in the promotion of trade and regional integration,” Mr Mwale said.
The project has been constructed by Daewoo Engineering and Construction of South Korea.