Sustainable transportation systems require optimal co-use of infrastructure. Different means of transportation use infrastructure for its operations. At certain points these means of transportation utilizes the same infrastructure, such as e.g. passages on or under bridges, which require co-modal coordination. To create means for such coordination, situational awareness needs to be established among involved actors by digitalization and principles for information sharing. In this short paper, a comodal transport system, GOTRIS (Göta Älv River Information Services), is used as a basis for a deeper understanding of the challenges for reaching an optimal co-use of infrastructure. By integrating information from maritime transports as one source in this coordination effort, sustainable transportation systems can be reached. This challenge is formulated in a research question and a preferred approach is stated.