Transport maintenance depots (TMDs) are critical infrastructure in Nigeria for ensuring road safety and serviceability of vehicles. These facilities store spare parts, perform repairs, and provide services to vehicle operators. A DID analysis was conducted using data from TMDs across Nigeria, with pre- and post-intervention periods. The model accounts for potential confounders such as regional variations and operator characteristics. The DID analysis indicated a significant reduction in vehicle breakdowns by 25% within the intervention period compared to non-intervention regions. TMD systems have demonstrated substantial risk-reducing effects, with estimated reductions measured at the 95% confidence interval. Further studies should explore scalability and cost-effectiveness of TMDs in other sectors such as railroads and aviation. Transport Maintenance Depots, Risk Reduction, Difference-in-Differences Analysis, Vehicle Safety The maintenance outcome was modelled as $Y_{it}=\beta_0+\beta_1X_{it}+u_i+\varepsilon_{it}$, with robustness checked using heteroskedasticity-consistent errors.