As interest in automated vehicles increases, there is a need for automated vehicles and traffic management for them in transportation field is being raised, and related researches are being actively carried out. Traffic management for automated vehicles can be divided into longitudinal and lateral directions as in existing traffic management, but traffic management detailed strategies can be different for each direction. In this study, automated vehicles are applied to the variable speed limit, which is one of the longitudinal traffic management techniques, and the possibility of using automated vehicles in the variable speed limiting system is examined. Manual vehicles can receive traffic information by VMS, while V2X is used for automated vehicles. Therefore, various traffic information including speed limit information can be received from the road infrastructure ahead of manual vehicles. Simulation of how such a vehicle-infrastructure cooperation system can be utilized in a variable speed limit system is conducted and analyzed by market penetration rate (MPR) of automated vehicles. It is expected that the variable speed limit system of automated vehicles utilization, which is invetigated in this study, will be utilized for transportation management in the automated vehicles future.