Knowledge Mapping and Thematic Evolution of Transportation Management System Research in Nigeria and South Africa: A South-South Scientometric Perspective

This paper presents a comprehensive scientometric analysis of Transportation Management System (TMS) research in Nigeria and South Africa between 2005 and 2025, with a focus on Global South dynamics. Using data sourced from Scopus and visualized via VOSviewer, the study maps literature trends, publication types, keyword occurrences, institutional affiliations, and bibliometric coupling. The findings reveal a mature and diverse TMS research landscape in South Africa characterized by strong institutional collaboration and international visibility. Research themes include intelligent vehicle highway systems, adaptive traffic management, smart city planning, and decision support systems led by institutions such as the University of Cape Town, University of Johannesburg, CSIR, and the eThekwini Transport Authority. This reflects a well-integrated ecosystem between academia, industry, and government. In contrast, Nigeria demonstrates concentrated but emerging research activity, primarily from institutions such as the University of Lagos and the University of Ilorin. The focus is largely on urban traffic management, congestion reduction, and early-stage TMS initiatives. Despite some emphasis on data-driven approaches, keyword analysis shows limited thematic diversity in Nigerian literature. By comparing the two countries within the South‒South framework, this study identifies a knowledge gap, particularly in Nigeria, which presents an opportunity to expand the research scope and thematic variety. Overall, the paper provides valuable strategic insights into the evolution of TMS research in Africa and underscores the importance of intelligent, sustainable and data-driven transport systems to increase the efficiency of resilience and environmental performance across the continent.