[1] The A4 highway starts at the city of Calabar in Cross River State, positioned in the southern part of the country.

[3] The route includes several key cities and towns: The A4 highway merges with the A3 highway near the city of Maiduguri in Borno State, providing a vital link between the southern coastal regions and the northeastern part of Nigeria.

[4] The A4 highway intersects with other major routes at various points along its course, facilitating travel and trade across Nigeria.

Notable junctions on the A4 include: The A4 highway connects several major cities and towns in Nigeria, facilitating both intra-city and inter-city transportation.

Prominent cities along the A4 route include: The A4 highway's geographical significance and its role in enhancing connectivity in Nigeria make it a crucial part of the nation's road network.