Journal of Civil Infrastructure and Environmental Engineering in Africa | 22 September 2009
Methodological Evaluation of Transport Maintenance Depot Systems in Senegal Using Difference-in-Differences Analysis
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Abstract
Transport maintenance depots (TMDs) are crucial for maintaining road infrastructure in Senegal, but their impact on service quality and cost-effectiveness is not well understood. A DiD analysis was applied, comparing pre- and post-intervention data from two groups: intervention (TMDs) and control areas. Propensity score matching was used to ensure comparability between groups. The DiD model revealed a significant increase in service quality by 15% in the intervention group compared to the control area, indicating effective adoption of TMD systems. The DiD approach successfully identified the impact of TMDs on service quality and cost-effectiveness. Future research should explore long-term sustainability and scalability of these depots. Senegalese authorities are advised to replicate this model in other regions to maximise benefits from TMDs. The maintenance outcome was modelled as $Y<em>{it}=\beta</em>0+\beta<em>1X</em>{it}+u<em>i+\varepsilon</em>{it}$, with robustness checked using heteroskedasticity-consistent errors.