VMS(Variable Message Sign) is a function of ITS(Intelligent Transport System) that provides real-time traffic information to users to facilitate traffic flow. However, the operational status of the current VMS and ITS operations does not provide excessive amounts of information in terms of information design, or increase reading time or provide efficient guidance due to unclear information boundaries. The current VMS design requires a more efficient information design support system, which creates visual discomfort by applying only the colors highlighted by the relevant regulations, and uses inconsistent or unnecessary words for writing style, keyboard, and message composition and alignment. In the view of VMS-related studies, focusing on statistical technologies on the improvement of visibility and legibility of Information elements according to user characteristics, this study sought to improve the public character of information and facility design by approaching the VMS from a Public Design perspective. This study analyzed current conditions and problems based on the research perspectives of preceding studies, presented the direction of improvement of the perceptual efficiency of the VMS from the information hierarchy, and developed a detailed approach to urban public design and facilities environment. The improvement direction presented as the result of the study was to secure verification and objectivity of the research contents by conducting a deep-seated expert interview.