Influence Mechanism of Transportation Integration on Industrial Agglomeration in Urban Agglomeration Theory—Taking the Yangtze River Delta Urban Agglomeration as an Example

This study selected the Yangtze River Delta urban agglomeration as research area, combining it with current situation of transportation development to construct integration index system and evaluate status integration. The examined influence mechanism infrastructure on industrial agglomeration. results are follows: (1) From 2011–2020, agglomeration’s showed a clear upward trend. (2) level local played an important role in promoting Promoting neighboring areas had negative spillover effect this region. Developing other regions insignificant positive (3) Urban impacted regional agglomeration, mainly through “cost effect.” Thus, cities 2020 need accelerate construction relevant so promote integrated higher-quality