The Spatial Spillover Effect and Function Routes of Transport Infrastructure Investment on Economic Growth: Evidence from Panel Data of OECD Members and Partners

Transport infrastructure connectivity is a spatial basis for economic development and the spillover feedback effects of transport investment (TII) have become an impetus growth (EG). However, existing research does not consider TII on gross EG multiple structures. To explore relationships functional routes between EG, Durbin model (SDM) was used to empirically analyze effect from geographical perspectives based panel data 2007 2019 35 members partners Organization Economic Cooperation Development (OECD+). On this basis, structural equation (SEM) established reveal mediating EG. Results show that (1) SDM–SEM hybrid method can function theoretical analysis empirical research; (2) according SDM model, in high-income OECD+ countries shows positive under distance, while upper-middle-income has negative effect; (3) route implies exerts it mainly affects indirectly by means including industrial structure (IS), rate contribution key FR3 67.25%. The following suggestions are proposed: necessary enhance intensity effective infrastructure, focus weak links pay attention burgeoning fields countries; differentiated strategies required be formulated with different income levels; give full play should optimized, so as improve benefits TII.