Book 4.2 Faculty of Automotive and Transport EngineeringBook 4.2 · Sustainable and Intelligent Transport Systems, Technologies and Logistics FRI-20.21-2-SITSTL-12 NEW OPPORTUNITIES FOR INNOVATIVE DEVELOPMENT OF TRANSPORT IN THE DANUBE REGION OF BULGARIA Cite Cite this paper× Citation styleAPA 7IEEEChicago Author–DateHarvardBibTeXRIS DownloadCopy Velizara Pencheva, Asen Asenov, Juliana Popova