A comparative analysis of the human development index and road safety outcomes in the European Union

Road traffic safety remains a critical concern in public health policy, especially amidst socio-economic transformation within the European Union. While prior research suggests a correlation between human development and traffic safety outcomes, the systemic mechanisms driving this relationship remain underexplored. This study investigates the association between the Human Development Index (HDI) and two key safety indicators—fatalities per 100,000 people and fatalities per 10,000 vehicles—across 27 EU countries from 2005 to 2020. The research identifies converging and diverging safety trajectories linked to developmental stages using a combined analytical approach that integrates time-series trends, Trinca Model classification, and K-means clustering. Findings reveal that higher HDI consistently correlates with lower fatality rates, yet the relationship becomes nonlinear beyond certain thresholds, signaling performance plateaus in mature systems. Moreover, countries with transitional profiles exhibit variable progress, reflecting structural and governance disparities. The results underscore that reducing traffic fatalities requires more than economic growth—it demands institutional capacity, integrated policies, and culturally embedded safety norms. By framing road safety as a developmental process, the study offers policy-relevant insights into targeted interventions tailored to each country’s systemic maturity.