{ "background": "The persistent inefficiency of transport infrastructure maintenance in Nigeria undermines economic development and road safety. Despite policy initiatives to establish and upgrade maintenance depots, systematic evaluation of their adoption and operational effectiveness across different tiers of government is lacking.", "purpose and objectives": "This policy analysis evaluates the adoption rates of formalised transport depot maintenance systems across Nigeria. It aims to quantify the influence of multilevel factors—including state-level governance, funding allocation, and depot technical capacity—on system uptake and to assess the impact of recent federal policy frameworks.", "methodology": "A multilevel regression analysis was conducted using a longitudinal dataset compiled from federal and state transport authorities. The core model is specified as $\\text{Adoption}{ij} = \\beta{0j} + \\beta{1}X{ij} + \\gamma Zj + u{0j} + e_{ij}$, where $i$ denotes depots and $j$ states. Inference is based on robust standard errors clustered at the state level.", "findings": "Adoption rates are significantly higher in states with dedicated maintenance budgets, showing a 34% increase compared to those without. The analysis indicates that federal policy interventions had a positive but statistically insignificant average effect (p > 0.05), with substantial heterogeneity explained by local institutional capacity.", "conclusion": "The adoption of depot maintenance systems is predominantly driven by sub-national commitment and resource allocation, not federal policy mandates alone. This reveals a critical implementation gap in national transport infrastructure strategy.", "recommendations": "Policy must shift from centralised mandate to incentivised support, requiring conditional grants to states tied to verifiable depot performance metrics. A national technical capacity-building programme for depot managers should be established.", "key words": "infrastructure policy, multilevel modelling, maintenance management, transport engineering, institutional analysis", "contribution statement": "This study provides the first quantitative, multilevel evaluation of transport maintenance policy in Nigeria, introducing a novel methodological framework for engineering policy analysis that