We are developing a traffic management software package based on RMF proposed by OSRF. With the non-face-to-face situation due to the COVID-19, cases of using multiple mobile robots in various fields are increasing like warehouses, hospitals, and so on. However, it is difficult to control multiple robots without collisions or deadlocks when robots share the common narrow space where only one robot can pass through. In this situation, the robots recognize each other as obstacles, resulting in a deadlock problem. To solve this problem, we have researched and developed a traffic management software package that can be applied to RMF Core.