Synergy effects of highway investments on the Turkish economy: An application of an integrated transport network with a multiregional CGE model

Piskin M., Hewings G. J. D., Hannum C. M.

TRANSPORT POLICY, vol.95, pp.78-92, 2020 (SSCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 95
  • Publication Date: 2020
  • Doi Number: 10.1016/j.tranpol.2020.05.011
  • Journal Name: TRANSPORT POLICY
  • Journal Indexes: Social Sciences Citation Index (SSCI), Scopus, Academic Search Premier, Aquatic Science & Fisheries Abstracts (ASFA), Business Source Elite, Business Source Premier, Geobase, Index Islamicus, PAIS International, Pollution Abstracts, Public Affairs Index, Civil Engineering Abstracts
  • Page Numbers: pp.78-92
  • Istanbul Technical University Affiliated: Yes


We develop a Multi-Regional Spatial Computable General Equilibrium (TurkSCGE) model for economic analysis of highway projects, estimating their impacts on regional welfare and economic outcomes in Turkey. The framework integrates a transport sub-model that estimates minimum distances with a multiregional Computable General Equilibrium model that estimates economic aggregates. TurkSCGE identifies eight sectors in each of 11 regions. Three experiments explore the impacts of decreases in transportation margins from 'distance shortening'. The three highway projects involved are estimated to yield a combined increase in GDP of 1.6%. However, the new highways in eastern Turkey, connecting eastern regions to each other and the west are shown to be best options for improving welfare in poorer regions.