I. Introduction
Efficient and well-maintained transport infrastructure supports economic growth by allowing for movement of people and goods between different countries which facilitates improved trade. It also allows for increased job opportunities which, as a result, lowers unemployment rates [1], [2], [3], [4]. The underdevelopment of transportation systems in Africa is one of the main reasons for poor development in comparison to other continents. This is evident from the intraregional trade in Africa which is less than 15%, compared to North America (48%), Asia (58%) and Europe (67%) [5]. Exporters and importers typically need 50% more time for transporting goods in Africa, than for example, in East Asia [6]. Congested and poorly maintained roads together with poor transportation infrastructure contribute to this [7]. Transport costs in Africa are among the highest in the world, which hinders its ability to increase trade and development. Sea transport is seven time less expensive than land transport, and while Africa is trading 80% of its goods via sea transport, many African landlocked countries experience costly transport fees to move their goods to the nearest harbour. Specifically in Southern Africa, 50% of the countries are landlocked [8]. Also, passenger transport in Africa, is predominantly done by foot or by road (e.g. cars, minibuses) which is dangerous, while air travel is too expensive for the majority of people of Africa [9], [10], [11].