ITU‐T's Technical Reports and Specifications 741 9 Milestone Here, we give the milestone of open data innovation in smart sustainable city mainly from the viewpoint of data management, infrastructure. In this document, each chapter has their dedicated focuses. However, several common problems and solutions potentially lie over different discussions. Considering the overlap of each chapter, the roadmap model described here is categorized into the following three groups; 1st Open data issue, 2nd Application Services in Smart Sustainable City, 3rd Security and Anonymization. All items covered in this roadmap are given in this document and are arranged into the three groups above. Timeline: (today‐2020, 2020‐2040, 2040 and beyond) +‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐> (normal scale) +‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐#‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐> (with the point of technological accomplishment) Open data issue ‐ Open data in smart sustainable city Open data is the key of services in smart sustainable city. (today‐2020, 2020‐2040, 2040 and beyond) +‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐> ‐ The use of smart energy data Energy data as open data changes grid system to smart grid, which becomes a component of smart sustainable city. (today‐2020, 2020‐2040, 2040 and beyond) +‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐> ‐ Smart transportation data ITS and automatic driving is one of the major component of smart sustainable city. (today‐2020, 2020‐2040, 2040 and beyond) +‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐#‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐> ‐ Location data Location services is useful for every smart sustainable city services.