The prospects for aligning transport, spatial, and development planning at the regional level in Slovenia are presented in this article. We focus primarily on assessing the possibility of linking and interweaving the contents of documents provided for existing legislation, as well as legislation that is in the preparation phase. First, we present the general factors of differentiation and connection between the documents of the considered areas of planning. Then, we present the substantive factors of differentiation and the connection between the documents at the state level. In the next chapter, we present emerging technologies and transport services and their inclusion in spatial, development, and transport planning in national documents and regional development programs. In the last part of the article, we present the final findings and proposals for the substantive integration of the preparation of transport, spatial, and development planning documents at the regional level in Slovenia. The article was prepared in the framework of the CARE4CLIMATE project – boosting greenhouse gas emissions reduction by 2020 with a view to 2030 – promoting sustainable transport, energy efficiency, renewable energies, and sustainable, climate-protecting land use in the transition to a low-carbon society.