A cross-country analysis of the influence of road infrastructure on human development

This study examines the associations between road infrastructure and health, education, and income indicators of the Human Development Index (HDI). Using a panel dataset covering 114 countries between 2015 and 2019, a two-way fixed-effects regression framework was employed to jointly assess the roles of road network density and road quality across heterogeneous socioeconomic contexts. The results indicate that education outcomes exhibit the most consistent associations with road infrastructure, with both road quality and network density showing positive relationships. Health outcomes are more closely associated with road quality, while income-related associations are weaker and less uniform across model specifications. Stratified analyses reveal substantial contextual heterogeneity: associations between road infrastructure and human development are more pronounced in Global South countries, whereas no statistically significant relationships are observed in the Global North. Population density is associated with systematic differences in how road infrastructure relates to human development, with network density playing a larger role in low-density contexts and road quality becoming increasingly relevant as population density increases. Overall, the findings highlight that the relationship between road infrastructure and human development is multidimensional and context-dependent. The results underscore the importance of considering both infrastructure quality and spatial coverage when designing road transport policies, particularly in developing economies, and suggest that transportation investments are most effective when integrated with broader strategies in education, health, and economic development.