The main objective of this study is to create an overview of, and to analyse, which standards that are directly or indirectly central for ERS in the area of intelligent transport systems (ITS) and electronic fee collection (EFC). The study employs a combination of qualitative and quantitative methods including literature studies, an interactive stakeholder workshop, and expert reviews of a tentative listing of ITS and EFC standards that are potentially applicable to ERS. The main result is a preliminary inventory of ITS and EFC standards, including 45 EFC standards, of which 33 have been marked as potentially applicable to ERS.