The A3 highway is a major arterial road in Nigeria, connecting the city of Port Harcourt in the south to the Cameroon border at Gamboru in the northeast.

It starts from Port Harcourt in the south and heads north, passing through several cities and regions, including Aba, Umuahia, Okigwe, Enugu, Ngwo, Makurdi, Lafia, Jos, Bauchi, Potiskum, Damaturu, Maiduguri, and finally reaching Gamboru in the northeast at the Cameroon border.

The highway eventually crosses the border into Cameroon at Gamboru and connects to N'Djamena, the capital of Chad.

[3] On May 13, 2014, the House of Representatives called on the Federal Government to rebuild the Gamboru Bridge, which serves as a crucial link between the border town and other parts of Borno State.

[4] On February 9, 2020, a tragic massacre occurred on the A3 highway in Auno, located between Damaturu and Maiduguri.